Sōsuke Esumi

Sōsuke Esumi (江角 走輔, Esumi Sōsuke), nicknamed the "Speed King", was a former race car driver who possesses a sunny disposition and was known amongst his racing team as "Miracle Esumi" for his belief in miracles. Unyielding to the point of obstinacy and confident to a fault, he confronts all obstacles without hesitation and is highly protective of his teammates. After defeating the Gaiark Clan, he returns to racing, albeit as a go-kart driver.^[1]

Sōsuke can transform into Go-on Red (ゴーオンレッド, Gōon Reddo). While transformed, he can perform the Go-on Thrust (ゴーオンスラスト, Gōon Surasuto) and Spin Rod Crash (スピンロッドクラッシュ, Supin Roddo Kurasshu) attacks via the Mantan Gun in Rod Mode.

During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, Sōsuke learns the Engine Fist moves Geki Speedor Saber Straight (ゲキスピードルサーベルストレート, Geki Supīdoru Sāberu Sutorēto) and Drrr-Drrr Bullet (ドルドル弾, Doru Doru Dan). With Geki Red and Rio, he can perform the Geki-Rin Engine Bullet (激臨炎神弾, Gekirin Enjin Dan) attack.

During the events of the crossover film Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!, Sōsuke utilizes Shinken Red's Dinosaur Disk in conjunction with the Mantan Gun to transform into Hyper Go-on Red (ハイパーゴーオンレッド, Haipā Gōon Reddo), granting the aforementioned sidearm in Rod Mode similar capabilities as the Kyoryumaru.^[1]

Sōsuke Esumi is portrayed by Yasuhisa Furuhara (古原 靖久, Furuhara Yasuhisa). As a child, he is portrayed by Hiroto Terui (照井 宙斗, Terui Hiroto).

Renn Kōsaka

Renn Kōsaka (香坂 連, Kōsaka Ren), nicknamed the "Cyclopedia" for his attention to the smallest detail and "mother" (オカン, okan) for his doting personality and cooking expertise, is the Go-ongers' talkative second-in-command and chief technician who formerly worked as a bus driver. Over the course of the series, he builds or fine-tunes many of the Go-ongers' weaponry and helps the Engines combine into stronger forms. Following the Gaiark's defeat, Renn becomes Sōsuke's mechanic in the go-kart racing circuit.^[2]

Renn can transform into Go-on Blue (ゴーオンブルー, Gōon Burū). While transformed, he can perform the Go-on Drift (ゴーオンドリフト, Gōon Dorifuto) and Sniper Shoot (スナイパーシュート, Sunaipā Shūto) attacks via the Mantan Gun in Rod and Gun Mode respectively.

During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, Renn learns the Engine Fist move On-on Bullet (オンオン弾, On'on Dan).^[2]

Renn Kōsaka is portrayed by Shinwa Kataoka (片岡 信和, Kataoka Shinwa). As a child, he is portrayed by Shunpei Ijuin (伊集院 竣平, Ijūin Shunpei).

Saki Rōyama

Saki Rōyama (楼山 早輝, Rōyama Saki), nicknamed the "Sweet Angel", was a concessions vendor who worked the stands of the Twin Ring Motegi racetrack and is known for cheerful, eager personality, which stemmed from an encounter with a woodland spirit who taught her to always "smile, smile". Amidst the Go-ongers' fight with the Gaiark, Saki briefly breaks off from her teammates to form the G3 Princess (G３プリンセス, Jī Surī Purinsesu) and Go-on Princess (ゴーオンプリンセス, Gōon Purinsesu) idol groups in order to defeat a separate foe on two separate occasions. Following the Gaiark's defeat, Saki goes on to fulfill her dream of opening a cake shop.^[3]

Saki can transform into Go-on Yellow (ゴーオンイエロー, Gōon Ierō). While transformed, she can perform the Go-on Spin (ゴーオンスピン, Gōon Supin) and Machinegun Shoot (マシンガンシュート, Mashingan Shūto) attacks via the Mantan Gun in Rod and Gun Mode respectively. With Go-on Silver, she can perform the Flower Cannonball (フラワーキャノンボール, Furawā Kyanonbōru) finisher.

With her fellow G3 Princess members, Saki can perform the G3 Triangle (G３トライアングル, Jī Surī Toraianguru) attack and the Princess Cannonball (プリンセスキャノンボール, Purinsesu Kyanonbōru) finisher. With her fellow Go-on Princess members, she can perform the Princess Triple Attack (プリンセストリプルアタック, Purinsesu Toripuru Atakku) and the Princess Triple Punch (プリンセストリプルパンチ, Purinsesu Toripuru Panchi) attack.

During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, Saki learns the Engine Fist move V-V Bullet (ブイブイ弾, Bui Bui Dan).^[3]

Saki Rōyama is portrayed by Rina Aizawa (逢沢 りな, Aizawa Rina) as an adult and by Asumi Kikuchi (菊池 和澄, Kikuchi Asumi) as a child.

Hanto Jō

Hanto Jō (城 範人, Jō Hanto), nicknamed the "Vagabond", is an enthusiastic, kind-hearted, but immature freeter working part-time at the Doki Doki Pizzeria who became a Go-onger after helping Gunpei Ishihara return the original Go-ongers' Engine Casts.^[4]

Hanto can transform into Go-on Green (ゴーオングリーン, Gōon Gurīn). While transformed, he can perform the Cycle Punch (サイクルパンチ, Saikuru Panchi) attack.

During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, Hanto learns the Engine Fist move Bir-Bir Bullet (バルバル弾, Baru Baru Dan).^[4]

Hanto Jō is portrayed by Masahiro Usui (碓井 将大, Usui Masahiro).

Gunpei Ishihara

Gunpei Ishihara (石原 軍平, Ishihara Gunpei), nicknamed the "Chaser", is an insecure and buffoonish former police officer with excellent marksmanship and a passion for justice who tries to put on a cool and serious front. After witnessing the original Go-ongers during their initial battles with Gaiark, Gunpei quits the police force after they refuse to help. Upon discovering the Go-ongers' identities, he goes to extreme lengths to join them, going so far as to kidnap their ally, Bomper, and steal their Engine Casts. Upon learning of how they were chosen, Gunpei returns the casts and becomes a Go-onger. Following the Gaiark's defeat, Gunpei returns to the police force and becomes a detective.^[5]

Gunpei can transform into Go-on Black (ゴーオンブラック, Gōon Burakku).

During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, Gunpei learns the Engine Fist move Ganga Ganga Bullet (ガンガガンガ弾, Ganga Ganga Dan).

Gunpei Ishihara is portrayed by Kenji Ebisawa (海老澤 健次, Ebisawa Kenji).

Hiroto Sutō

Hiroto Sutō (須塔 大翔, Sutō Hiroto), nicknamed the "Philosopher", is the cool and aloof leader of the Go-on Wings who is proficient in combat. He trains extensively in boxing and kickboxing, and possesses an esper ability that allows him to sense nearby danger. Despite his cold exterior, he possesses a fiery passion and a willingness to put his life on the line to protect those he cares about. Due to this, he became known as the Go-ongers' father figure.^[6]

Hiroto can transform into Go-on Gold (ゴーオンゴールド, Gōon Gōrudo).

Hiroto Sutō is portrayed by Hidenori Tokuyama (徳山 秀典, Tokuyama Hidenori) as an adult and by Shogo Ehara (江原 省吾, Ehara Shōgo) as a child.

Miu Sutō

Miu Sutō (須塔 美羽, Sutō Miu), nicknamed the "Lovely Sensation", is Hiroto's younger sister with a "princessy" attitude, skill in aikido, and an esper ability that allows her to see things through the flowers she tends to. She displays an over-dependence on her brother, who she refers to as "ani",^{[lower-alpha 1]} along with a desire to improve those she perceives as lesser than her. Over the course of the series, she develops a close friendship with Saki Rōyama and a hesitant crush on Sōsuke Esumi. Additionally, she temporarily breaks off from Hiroto to form the G3 Princess and Go-on Princess idol groups to defeat a separate foe on two separate occasions.^[7]

Miu can transform into Go-on Silver (ゴーオンシルバー, Gōon Shirubā).

Miu Sutō is portrayed by Yumi Sugimoto (杉本 有美, Sugimoto Yumi) as an adult and by Airi Yoshida (吉田 愛里, Yoshida Airi) as a child.

Arsenal

The Go-ongers' technology revolves around the Engine Souls (炎神ソウル, Enjin Sōru), which hold the Engines' souls, along with other types of Souls.

• Mantan Gun (マンタンガン, Mantan Gan):^{[lower-alpha 2]} The Go-ongers' gas pump dispenser-like sidearm that has a Gun Mode (ガンモード, Gan Mōdo) for performing the Go-on Cannonball (ゴーオンキャノンボール, Gōon Kyanonbōru) finisher and a Rod Mode (ロッドモード, Roddo Mōdo) for performing the Go-on Screw (ゴーオンスクリュー, Gōon Sukuryū) finisher.
• Highway Buster (ハイウェイバスター, Haiwei Basutā): The combined form of Go-on Red, Blue, and Yellow's Go-on Gears.
  • Road Saber (ロードサーベル, Rōdo Sāberu): The personal weapon of Go-on Red, with which he can perform the Saber Straight (サーベルストレート, Sāberu Sutorēto) attack. With the Road Saber and a Rocket Dagger, he can perform the Saber Straight: Go-on Rendezvous (サーベルストレート・ゴーオンランデブー, Sāberu Sutorēto Gōon Randebū) and the Saber Spin Crash (サーベルスピンクラッシュ, Sāberu Supin Kurasshu) attacks.
  • Garage Launcher (ガレージランチャー, Garēji Ranchā): The personal weapon of Go-on Blue, with which he can perform the Launcher Starter (ランチャースターター, Ranchā Sutātā) attack and its Jumping Attack (ジャンピングアタック, Janpingu Atakku) variation.
  • Racing Bullet (レーシングバレット, Rēshingu Baretto): The personal weapon of Go-on Yellow, with which she can perform the Bullet Crash (バレットクラッシュ, Baretto Kurasshu) attack.
• Junction Rifle (ジャンクションライフル, Jankushon Raifuru): The combined form of Go-on Green and Black's Go-on Gears.
  • Bridge Axe (ブリッジアックス, Burijji Akkusu): The personal weapon of Go-on Green, with which he can perform the Axe Tooling (アックスツーリング, Akkusu Tsūringu) attack.
  • Cowl Laser (カウルレーザー, Kauru Rēzā): The personal weapon of Go-on Black, with which he can perform the Laser Highbeam (レーザーハイビーム, Rēzā Haibīmu) attack.
• Super Highway Buster (スーパーハイウェイバスター, Sūpā Haiwei Basutā): The combined form of all five Go-ongers' Go-on Gears.
• Handle Blaster (ハンドルブラスター, Handoru Burasutā): A steering wheel-like weapon that has a Handle Mode (ハンドルモード, Handoru Mōdo) for the Go-ongers to operate EngineOh G6, G9, and G12 and a Blaster Mode (ブラスターモード, Burasutā Mōdo) for performing finishers via the Blaster Soul (ブラスターソウル, Burasutā Sōru).
• Wing Booster (ウイングブースター, Uingu Būsutā): The combined form of the Go-on Wings' Wing Triggers and Rocket Daggers.
  • Wing Trigger (ウイングトリガー, Uingu Torigā): The Go-on Wings' transformation device which also serve as joysticks for piloting their Engines and SeikuOh.
  • Rocket Dagger (ロケットダガー, Roketto Dagā):^{[lower-alpha 3]} The Go-on Wings' sidearm that is capable of performing the Burning Dagger (バーニングダガー, Bāningu Dagā), Freezing Dagger (フリージングダガー, Furījingu Dagā), Lightning Dagger (ライトニングダガー, Raitoningu Dagā) Shining Dagger (シャイニングダガー, Shainingu Dagā), Shooting Dagger (シューティングダガー, Shūtingu Dagā), Jumping Dagger (ジャンピングダガー, Janpingu Dagā), and Dagger Acrobat (ダガーアクロバット, Dagā Akurobatto) attacks.
• Armored Wheel Go-Roader GT (装甲車輪ゴローダーGＴ, Sōkō Sharin Gorōdā Jī Tī):^{[lower-alpha 4]} A wheel-like robot that Hiroto and Jum-bowhale invented. Starting out in a palm-sized Wheel Mode (ホイールモード, Hoīru Mōdo), it can enlarge and transform into the humanoid Action Mode (アクションモード, Akushon Mōdo) via the Tokon Soul (トーコンソウル, Tōkon Sōru),^{[lower-alpha 5]} which Renn developed. In Action Mode, it can perform the Go-Roader Kick (ゴローダーキック, Gorōdā Kikku) and the Go-Roader Strike (ゴローダーストライク, Gorōdā Sutoraiku) attacks. In a human-sized Wheel Mode, it can perform the Go-Roader Attack (ゴローダーアタック, Gorōdā Attaku) finisher.^[9] Additionally, the Engines' Souls are compatible with the Go-Roader GT, allowing them to effectively assume a humanoid form.
• Kankanbar (カンカンバー, Kankanbā):^{[lower-alpha 6]} A crossing gate-like weapon developed by Renn Kōsaka to utilize the ancient Engines' power that can switch between Rod Mode and Gun Mode as well as hold two Engine Souls at once. With T-Line and K-Line's Souls, it can perform the Crossing Stopper (クロッシングストッパー, Kurosshingu Sutoppā) finisher on its own and the Double Cross Stopper (ダブルクロスストッパー, Daburu Kurosu Sutoppā) attack alongside the Mantan Gun with Kishamoth's Soul.
  • Kankan Mantan Gun (カンカンマンタンガン, Kankan Mantan Gan): The combined form of the Mantan Gun and Kankanbar that can utilize three Engine Souls to perform the Kankan Kong Express (カンカンカンエクスプレス, Kan Kan Kan Ekusupuresu) finisher via the ancient Engines' Souls as well as a Speedor Version (スピードルバージョン, Supīdoru Bājon) with Speedor, Bus-on, and BearRV's Souls.

Engines

The Go-ongers' mecha are the Engines (炎神, Enjin), denizens of Machine World who pursued the Gaiark Clan to the Human World. Due to being unable to maintain their true giant sizes for longer than ten minutes without suffering from fatal rusting, they are forced to separate their Engine Souls from their Engine Casts (炎神キャスト, Enjin Kyasuto) and choose the Go-ongers to assist them in keeping both safe. Through their bonds with their partners, the Engines are able to combine into stronger humanoid mecha forms.

With the Shinkengers' Origami, the Engines can perform the Modikara Cannonball (モヂカラキャノンボール, Mojikara Kyanonbōru) attack.

1. Engine Speedor (炎神スピードル, Enjin Supīdoru): Go-on Red's partner who resembles a racecar and a condor. While in his true size, he can perform the Speedor Burst (スピードルバースト, Supīdoru Bāsuto) attack, possesses incredible speed, and assume "Accel Full Throttle" mode, which allows him to glide and utilize his talons. Speedor is voiced by Daisuke Namikawa (浪川 大輔, Namikawa Daisuke).^[10]
2. Engine Bus-on (炎神バスオン, Enjin Basuon): Go-on Blue's partner who resembles a bus and a lion. While in his true size, he possesses incredible strength and Bus-on Missiles (バスオンミサイル, Basuon Misairu). Bus-on is voiced by Hisao Egawa (江川 央生, Egawa Hisao).^[11]
3. Engine BearRV (炎神ベアールＶ（ブイ）, Enjin Beārubui): Go-on Yellow's gutsy and spunky partner who resembles a Four-wheel drive truck and a bear. While in her true size, she possesses V V Missiles (ブイブイミサイル, Bui Bui Misairu) and can perform the BearR Attack (ベアールアタック, Beāru Atakku) and the BearR Press (ベアールプレス, Beāru Puresu) attack. As a member of Go-on Princess, she can perform the Princess Triple Attack or Princess Triple Punch alongside her fellow members. BearRV is voiced by Miki Inoue (井上 美紀, Inoue Miki).^[12]
4. Engine Birca (炎神バルカ, Enjin Baruka): Go-on Green's easy-going partner who resembles a motorcycle and an orca and displays a fondness for foreign words, having used Spanish, Italian, French, English, and Mandarin Chinese terms throughout the series. While in his true size, he wields the Bircutter (バルカッター, Barukattā) tail. Birca is voiced by Sōichirō Hoshi (保志 総一朗, Hoshi Sōichirō).^[13]
5. Engine Gunpherd (炎神ガンパード, Enjin Ganpādo): Go-on Black's justice seeking partner who resembles a police car and a German Shepherd. While in his true size, he possesses the Gunpherd Gun (ガンパードガン, Ganpādo Gan) nose and expert marksmanship. Gunpherd is voiced by Kenji Hamada (浜田 賢二, Hamada Kenji).^[14]
6. Engine Carrigator (炎神キャリゲーター, Enjin Kyarigētā): A member of the powerful Gian Race (ジャイアン族, Jaian Zoku) of Engines who resembles a semi-trailer truck and an alligator and displays a samurai-esque personality. While in his true size, he can carry two Engines on his back and does not require a partner, though he requires the most time to recharge his Engine Soul. Carrigator is voiced by Kyousei Tsukui (津久井 教生, Tsukui Kyōsei).^[15]
7. Engine Toripter (炎神トリプター, Enjin Toriputā): Go-on Gold's lively partner and a member of the rarely seen Wing Race (ウイング族, Uingu Zoku) of Engines who resembles a helicopter and a chicken. While in his true size, he possesses rotors and turrets armed with an infinite supply of energy bullets that allow him to perform the Toripter Batariot (トリプターバタリオット, Toriputā Batariotto) attack. Toripter is voiced by Shizuka Ishikawa (石川 静, Ishikawa Shizuka).^[16]
8. Engine Jetras (炎神ジェットラス, Enjin Jettorasu): Go-on Silver's calm partner and a member of the Wing Race who resembles a fighter jet and a tiger. While in his true size, he possesses Jetras Torahawk (ジェットラストラホーク, Jettorasu Torahōku) cruise missiles and can perform the Jetras Phantom (ジェットラスファントム, Jettorasu Fantomu) attack. Jetras is voiced by Kiyotaka Furushima (古島 清孝, Furushima Kiyotaka).^[17]
9. Engine Jum-bowhale (炎神ジャン・ボエール, Enjin Janboēru): A veteran member of the Wing Race and the leader of the Wing Engines who resembles a Boeing 747 and a baleen whale. While in his true size, he can perform the Bowhale Beam (ボエールビーム, Boēru Bīmu) attack and assume a flying wing-like Jet Mode (ジェットモード, Jetto Mōdo) for increased speed. Jum-bowhale is voiced by Tomomichi Nishimura (西村 知道, Nishimura Tomomichi).^[18]
10. Engine Kishamoth (炎神キシャモス, Enjin Kishamosu): A peaceful member of the Ancient Engines (古代炎神, Kodai Enjin) who resembles a steam locomotive and a mammoth and is incapable of speaking human languages due to arriving in the Human World, then called Dino World (ダイナワールド, Daina Wārudo), during the Mesozoic to battle the Horonderthal before going into hibernation and reawakening in the present. While in his true size, he can perform the Ice Age Express (アイスエイジエクスプレス, Aisu Eiji Ekusupuresu) attack.^[19]
11. Engine T-line (炎神ティライン, Enjin Tirain): A primitive member of the Ancient Engines who resembles a Shinkansen and a Tyrannosaurus, is also incapable of speaking human languages, and displays an intense hatred for the Savage Machine Clans.^[20]
12. Engine K-line (炎神ケライン, Enjin Kerain): A member of the Ancient Engines who resembles a Shinkansen and a Triceratops, is also incapable of speaking human languages, and specializes in breaking through enemy defenses with his horns.^[21]

Engine Combinations

The Engines can be assembled into larger mecha via Engine Combination (炎神合体, Enjin Gattai). Together, they can perform the Go-on Kick (ゴーオンキック, Gōon Kikku) and Go-on Punch (ゴーオンパンチ, Gōon Panchi) attacks.

• EngineOh (エンジンオー, Enjinō): The Go-ongers' first giant robot and the combination of Engines Speedor, Bus-on, and BearRV that is nicknamed the "Giant King of Engines" (巨大なる炎神の王, Kyodai naru Enjin no Ō) It is armed with the Go-on Sword (ゴーオンソード, Gōon Sōdo) and the V Shield (Ｖシールド, Bui Shīrudo) and can perform the Go-on Grand Prix (ゴーオングランプリ, Gōon Guran Puri) finisher. With GunBirOh and SeikuOh, EngineOh can perform the Go-onger Storm (ゴーオンジャーストーム, Gōonjā Sutōmu), Triple Punch (トリプルパンチ, Toripuru Panchi), and the Grand Prix Festival (グランプリフェスティバル, Guranpuri Fesutibaru) finishers.^[22] Additionally, EngineOh can combine with other Engines through Engine Armaments (炎神武装, Enjin Busō), which are as follows:
  • EngineOh Birca (エンジンオーバルカ, Enjinō Baruka): The combination of EngineOh and Engine Birca that can perform the Bircutter Slash (バルカッタースラッシュ, Barukattā Surasshu) finisher.^[23]
  • EngineOh Gunpherd (エンジンオーガンパード, Enjinō Ganpādo): The combination of EngineOh and Engine Gunpherd that can perform the Gunpherd Gunfire (ガンパードガンファイヤー, Ganpādo Ganfaiyā) finisher.^[24]
  • EngineOh Jetripter (エンジンオージェットリプター, Enjinō Jettoriputā): The combination of EngineOh and Engines Toripter and Jetras that is equipped with the Toripter Rotor (トリプターローター, Toriputā Rōtā) attack and Jetras Bow (ジェットラスボウ, Jettorasu Bō) and can perform the Jetori Bullseye (ジェットリブルズアイ, Jettori Buruzuai) finisher.^[25]
  • EngineOh Jetras (エンジンオージェットラス, Enjinō Jettorasu): The combination of EngineOh and Engine Jetras that can perform the Go-On Bullseye (ゴーオンブルズアイ, Gōon Burūzuai) finisher.
• GunBirOh (ガンバルオー, Ganbaruō): The Go-ongers' second giant robot and the combination of Engines Birca, Gunpherd, and Carrigator that is nicknamed "Another King of Engines" (さらなる炎神の王, Sara naru Enjin no Ō). It can perform the Bircutter Storm (バルカッターストーム, Barukattā Sutōmu), Bircutter Wrist Return (バルカッター小手返し, Barukattā Kote Gaeshi), Gunpherd Gunfire, and Bircutter Slash attacks, and the GunBir Grand Prix (ガンバルグランプリ, Ganbaru Guran Puri) finisher.^[26] Like EngineOh, GunBirOh can also combine with other Engines through Engine Armaments, which are as follows:
  • GunBirOh Toripter (ガンバルオートリプター, Ganbaruō Toriputā): The combination of Engines Gunpherd, Carrigator, and Toripter that can perform the Toripgun Batariot (トリプガンバタリオット, Toripugan Batariotto) finisher.
  • GunBirOh Jetras (ガンバルオージェットラス, Ganbaruō Jettorasu): The combination of Engines Birca, Carrigator, and Jetras that can perform the Trabircutter Slash (トラバルカッタースラッシュ, Torabarukattā Surasshu) finisher.
• EngineOh G6 (エンジンオーG６, Enjinō Jī Shikkusu): The combination of EngineOh and GunBirOh that can perform the G6 Kick (G６キック, Jī Shikkusu Kikku) attack and the G6 Grand Prix (G６グランプリ, Jī Shikkusu Guran Puri) finisher.^[27]
• SeikuOh (セイクウオー, Seikūō):^{[lower-alpha 7]} The Go-on Wings' personal giant robot that is nicknamed the "Sky Punching Aerial King" (空を制する天空の王, Sora o Seisuru Tenkū no Ō). It can perform the Toripcutter (トリプカッター, Toripukattā), Jetras Boomerang (ジェットラスブーメラン, Jettorasu Būmeran), Jetori Turbulence (ジェットリタービュランス, Jettori Tābyuransu), and Seiku Sonic (セイクウソニック, Seikū Sonikku) attacks and the Seiku Impulse (セイクウインパルス, Seikū Inparusu) finisher.^[28] Like EngineOh and GunBirOh, SeikuOh can combine with other Engines through Engine Armaments, which are as follows:
  • SeikuOh Birca (セイクウオーバルカ, Seikūō Baruka): The combination of Engines Birca, Jetras, and Jum-bowhale that can perform the Birtras Torahawk (バルトラストラホーク, Barutorasu Torahōku) finisher.
  • SeikuOh Gunpherd (セイクウオーガンパード, Seikūō Ganpādo): The combination of Engines Gunpherd, Toripter, and Jum-bowhale that can perform the Guntori Gunfire (ガントリーガンファイヤー, Gantorī Ganfaiyā) finisher.
• EngineOh G9 (エンジンオーG９, Enjinō Jī Nain): The combination of EngineOh, GunBirOh and SeikuOh that can perform the G9 Grand Prix (G９グランプリ, Jī Nain Guran Puri) finisher.^[29]
• KyoretsuOh (キョウレツオー, Kyōretsuō):^{[lower-alpha 8]} The Go-ongers' third giant robot and the combination of the Ancient Engines that is piloted by Go-on Red and nicknamed the "Powerful King of Trains" (強大な列車の王, Kyōdai na Ressha no Ō). It can perform the Railway Chop (電車道チョップ, Denshamichi Choppu), Dinosaur Kick (ダイナソーキック, Dainasō Kikku), Kyoretsu Dino Bite (キョウレツダイナバイト, Kyōretsu Daina Baito), and KishamoSteam (キシャモスチーム, Kishamosuchīmu) attacks and the Kyoretsu Express (キョウレツエクスプレス, Kyōretsu Ekusupuresu) finisher.^[30]
• EngineOh G12 (エンジンオーG12, Enjinō Jī Tuerubu): The combination of all 12 Engines that is nicknamed the "Ultimate King Who Triumphs Over Evil" (全ての悪を制する究極の王, Subete no Aku o Seisuru Kyūkyoku no Ō). It can perform the G12 Punch (G12パンチ, Jī Tuerubu Panchi) and G12 Kick (G12キック, Jī Tuerubu Kikku) attacks and perform the G12 Grand Prix (G12グランプリ, Jī Tuerubu Guran Puri) and the G12 Final Grand Prix (G12ファイナルグランプリ, Jī Tuerubu Fainaru Guran Puri) finishers.^[31] During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, EngineOh G12 can perform the Engine Beast Grand Prix (炎神ビーストグランプリ, Enjin Bīsuto Guran Puri) finisher alongside the Gekirangers' mecha, SaiDaiGekiRinTohja.
• Samurai Formation 23 (サムライフォーメーション23, Samurai Fōmēshon Tuentisurī): The combination of EngineOh G12 and the Shinkengers' mecha SamuraiHaOh that can perform the Samurai Engine Super Grand Release (侍・炎神・スーパー大開砲, Samurai Enjin Sūpā Daikaihō) finisher and appears exclusively in the crossover film Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!
• EngineOh G7 (エンジンオーG7, Enjinō Jī Sebun): The Miracle Engine Combination (ミラクル炎神合体, Mirakuru Enjin Gattai) of the Go-ongers and Go-on Wings' personal partners that can perform the 10 Years Grand Prix (10 Years グランプリ, Ten Iyāzu Guran Puri) finisher. This formation appears exclusively in the anniversary film Engine Sentai Go-onger: 10 Years Grand Prix.

Pollution Ministers

Originally thought to be the last of the Gaiark, the three Pollution Ministers end up on Earth to pollute it to serve as an ideal paradise for them and based themselves at Hellgailles Palace (ヘルガイユ宮殿, Herugaiyu Kyūden), which is powered by the Deus Haguru Magear (デウス・ハグル・マギア, Deusu Haguru Magia), an inexhaustible energy source that Yogostein brought with him from Machine World. Amidst their battle with Yogoshimacritein, the Go-ongers destroy the gear, causing Hellgailles Palace to self-destruct. During the events of the crossover film Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!, the Pollution Ministers are rebuilt, but choose not to continue the Gaiark Clan's plans and run off to the bottom of the Sanzu River. As of the events of the anniversary film Engine Sentai Go-onger: 10 Years Grand Prix, the ministers settle down in Junk World, but accidentally give rise to the Zontark Clan and join forces with the Go-ongers to stop them.

Hiramechimedes

Land Pollution Vice-Minister Hiramechimedes (害地副大臣ヒラメキメデス, Gaichi Fukudaijin Hiramekimedesu)^{[lower-alpha 13]} is Yogostein's subordinate and the Gaiark's top tactical genius. Originally a second-rate inventor who developed much of the Gaiark's arsenal, he plotted to assassinate Yogostein and take his position. However, the latter recognized the former's brilliance and awarded him with the yardstick-like Hacalibur (ハカリバー, Hakaribā) sword and promoted him to Vice-Minister. This caused Hiramechimedes to loyally devote himself to Yogostein's cause and he would go on to inspire fear in the Engines after achieving numerous victories.

On the day the Gaiark were expelled from Machine World, Hiramechimedes disappeared to mount a failed attack on the Wing Clan Engines before resurfacing in the Human World months later to serve under Yogostein once more. When the Wing Engines pursue him and gain help from the Go-on Wings, Hiramechimedes stages his banishment from the Gaiark in a plot to deceive the Go-ongers and kill Go-on Gold. When the heroes foil him, an ashamed Hiramechimedes refuses to return to Yogostein and spends several days calculating a new plan to kill the Go-ongers. Eventually concluding he needs raw power instead of his intellect, he sneaks back into the Hellgailles Palace and infuses himself with one hundred times the Bikkurium required for a regular Barbaric Machine Beast to undergo an Industrial Revolution. However, the stress of his upgrade breaks his mind as he undergoes a "Big Industrial Revolution" and transforms into the insane Detaramedes (デタラメデス, Detaramedesu).^{[lower-alpha 14]} He overpowers the Go-ongers, but is eventually scrapped by Go-on Red.

Despite this, his grudge against the Go-ongers keeps him from passing on. Unable to retake physical form and referring to himself as Urameshimedes (ウラメシメデス, Urameshimedesu),^{[lower-alpha 15]} he travels to the Braneworld of Samurai World, possesses a monstrous inhabitant named Bakki, and transforms further into Hirameki Bakki (ヒラメキ伐鬼, Hirameki Bakki) to take revenge on the Go-ongers, only to be exorcised by them.

Hiramechimedes is voiced by Kazuya Nakai.

Yogoshimacritein

Crime Minister Yogoshimacritein (総裏大臣ヨゴシマクリタイン, Sōridaijin Yogoshimakuritain)^{[lower-alpha 16]} is the Gaiark's Insurgent Highness (デンカノボウトウ, Denka no Bōtō) and Yogostein's father who wields a two-headed Kanabō-like weapon. As the most ruthless member of the Gaiark Clan, he desired to rule over all of the Braneworlds, having oversaw the near-extinction of the Engines' Gian Race and the destruction of three Braneworlds. After Kireizky arrives in the Human World, Yogoshimacritein uses the former's Bottomless Wastebin to enter the Human World himself and use it to power his Justice Dissolution (正義解散, Seigi Kaisan) attack, which can convert targets into wavelengths so long as the Deus Haguru Magear is active. When he uses his Puppet Regime (傀儡傀儡政権, Kugutsu Kairaiseiken) ability to turn Kitaneidas and Kegalesia into his puppets and reveals his willingness to sacrifice them, the Pollution Ministers assist the Go-ongers in destroying the Bottomless Wastebin and the Deus Haguru Magear to weaken Yogoshimacritein. He destroys his traitorous subordinates and utilizes the Third Industrial Revolution (第三次産業革命, Daisanji Sangyō Kakumei) ability to enlarge himself, but is scrapped by EngineOh G12.

Yogoshimacritein is voiced by Kiyoyuki Yanada, who also voices Yogostein.

Other members

• Barbaric Machine Clan Arelunbra Family (蛮機族アレルンブラ家, Bankizoku Arerunbura Ke): Preceding the Gaiark as the Engines' mortal enemies, the Arelunbra Family were sea-based androids who terrorized Machine World with their Water Pollution Machine Knights (害水機士, Gaisui Kishi) before their leader Nigorl left for the Human World and the Arelunbra faded into legend.
  • Water Pollution Machine Knight Uzumaquixote (害水機士ウズマキホーテ, Gaisui Kishi Uzumakihōte):^{[lower-alpha 17]} A servant of Nigorl who is armed with a jousting lance and shield with the ability to consume anything. After arriving in the Human World with Nigorl, Uzumaquixote became exposed to its clean surroundings, miniaturized, and trapped as a stone statue that a young Renn Kōsaka would find, assuming it to be a Ksitigarbha (地蔵, Jizō) statue. In the present, the Gaiark and Go-on Wings discover and fight over the statue until Kegalesia revives Uzumaquixote and has him attack the Go-ongers. After ingesting Bikkurium and enlarging himself, Uzumaquixote is scrapped by SeikuOh, GunBirOh, and EngineOh. Uzumaquixote is voiced by Naomi Kusumi (楠見 尚己, Kusumi Naomi).
  • Water Pollution Prince Nigorl zo Arelunbra (害水王子ニゴール・ゾ・アレルンブラ, Gaisui Ōji Nigōru zo Arerunbura):^{[lower-alpha 18]} The prince of the Arelunbra who wields the Nigorl Rapier (ニゴールレイピア, Nigōru Reipia), possesses mastery in fencing, and the ability to summon rain clouds. Unlike other Gaiark members, he displays a liking towards things he considers beautiful. After pining for and being spurned by Kegalesia, he arrived in the Human World, but entered suspended animation. The Gaiark revive Nigorl in the present, who turns his affections towards BearRV and attempts to marry her. Using his Water Pollution Fusion ability, he enlarges himself without Bikkurium and forcibly interfaces with Kegalesia to transform into Mix Kegalegorl (ミックス・ケガレゴール, Mikkusu Kegaregōru), with Kegalesia as a battery to increase his power. Despite this, he is defeated by the Go-ongers and left to die by Kegalesia. Nigorl is voiced by Kenji Nojima (野島 健児, Nojima Kenji).
• Barbaric Machine Clan Horonderthal (蛮機族ホロンデルタール, Bankizoku Horonderutāru):^{[lower-alpha 19]} A clan of ancient, giant clockwork Savage Machine Beasts that caused the extinction of the dinosaurs on Earth 65 million years ago with their violence-inducing Horonden Wave (ホロンデン波, Horondenpa) attack. The Ancient Engines battled the Horonderthal until they and an individual clan member were fossilized within a mountain. In the present, Yogostein seeks out the Horonderthal and eventually succeeds despite freeing the Ancient Engines as well. After Yogostein upgrades the Horonderthal with modern Gaiark technology, it defeats the Ancient Engines, but is scrapped by EngineOh G12 while Yogostein claims the Horonderthal's power for himself.
• Cleaning Minister Kireizky (掃治大臣キレイズキー, Sōji Daijin Kireizukī):^{[lower-alpha 20]} A Gaiark minister who "cleans" the slate of Braneworlds he has visited in order to acquire a special form of energy called Dokkirium (ドッキリウム, Dokkiriumu). He is armed with Seven Cleaning Tools (オソウジ七つ道具, Osōji Nanatsu Dōgu): the Duster Blade (ハタキブレード, Hataki Burēdo), the Broom Shotgun (ホウキショットガン, Hōki Shottogan), the Anti-Soul Rag (アンチソウルゾーキン, Anchi Sōru Zōkin), which can be wrung out into the Rag Grenade (ゾウキングレネード, Zōkin Gurenēdo), the Dustpan Shield (チリトリシールド, Chiritori Shīrudo), the Cotton Swab Kunai (メンボークナイ, Menbō Kunai), the Bottomless Wastebin (ムゲンゴミバコ, Mugen Gomibako), and the Bucket Bazooka (バケツバズーカ, Baketsu Bazūka). After destroying the Braneworlds of Sound World, Magic World, and Prism World (プリズムワールド, Purizumu Wārudo) as part of his quest, he arrives in the Human World to battle the Go-ongers until he loses his Wastebin. He ingests the Dokkirium he had collected and undergoes a Super Industrial Revolution (超産業革命, Chōsangyō Kakumei) to overpower the Go-ongers and Engines, but they form EngineOh G12 to defeat Kireizky. However, the Wastebin would later allow Yogoshimacritein to enter the Human World. Kireizky is voiced by Eiji Takemoto (竹本 英史, Takemoto Eiji).
• Danger Cabinet-Director Chirakasonne (危官房長官チラカソーネ, Kikanbō Chōkan Chirakasōne):^{[lower-alpha 21]} Yogoshimacritein's boiler-themed right-hand and practitioner of the Natural Litter Constitution Kenpō (天地羅苛死憲法, Tenchirakashi Kenpō) fighting style. Chirakasonne ingests Dokkirium and enlarges, but is scrapped by GunBirOh. Chirakasonne is voiced by Bin Shimada (島田 敏, Shimada Bin).

Arsenal

• Barbaric Machine Soldiers Ugatz (蛮機兵ウガッツ, Bankihei Ugattsu):^{[lower-alpha 22]} Android foot soldiers built to support the Barbaric Machine Beasts and pilot the Barbaric Dohmas. Additionally, Nigorl possesses a feminine variant called Beauty Ugatz (ビューティウガッツ, Byūti Ugattsu), which are stronger than regular Ugatz. During the events of the crossover film Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!, Batcheed utilizes Ugatz capable of transforming into motorcycles.
• Barbaric Dohma (蛮ドーマ, Bandōma): Cave cricket-like jet fighters invented by Hiramechimedes that can assume a frog-like walking mode.
  • Barbaric Dohma SP (Special) (蛮ドーマＳＰ, Bandōma Supesharu): Cave cricket and mantis-like jet fighters that serve as Hiramechimedes and the Pollution Minsters' personal transports that are each able to carry up to four Barbaric Dohma.

Barbaric Machine Beasts

The Barbaric Machine Beasts (蛮機獣, Bankijū) are monsters created by the Pollution Ministers to pollute the Earth and are, as such, usually divided into three types: Savage Land (害地, Gaichi), Savage Sea (害水, Gaisui), and Savage Sky (害気, Gaiki). The Barbaric Machine Beasts are infused with a special energy called Bikkurium (ビックリウム, Bikkuriumu) that is capable of enlarging them in a process called Industrial Revolution (産業革命, Sangyō Kakumei) and are based on machines or inventions that were present at the turn of the twentieth century. If they are scrapped, the dead Savage Machine Beasts shrink back to normal size and end up at the Savage Machine Beast Graveyard. In the film Engine Sentai Go-onger: Boom Boom! Bang Bang! GekijōBang!!, Yogostein takes advantage of this by developing the Savage Machine Beast program to utilize Ugatz souls to reanimate the Barbaric Machine Beasts into the Recycled Barbaric Machine Beast Army (リサイクル蛮機獣軍団, Risaikuru Bankijū Gundan), only for them to be re-scrapped by the Engines due to being much weaker than they used to be.