Kate Kennedy (born 1 April 1992)^[1] is a British actress, writer and director. She is best known for her portrayal as Kai-125 in the Paramount+ series Halo, and has also done voice acting for video games such as Assassin's Creed Valhalla, in addition to other roles in film and television.

One of Kennedy's first major roles was in the show Hunch as the titular superhero, which was shown at the Edinburgh Festival Fringe in 2018, receiving mostly positive reviews.^[2] The skit was adapted to a short film in 2020.

Kennedy was first cast for the Halo series in 2019 as the Spartan super soldier Kai-125, portrayed as a teammate to Master Chief.^[3] Despite being a tall woman at 6'3", Kennedy was still not tall enough to portray her character, as the Spartans are characterized as being over 7 feet tall, requiring her to wear platforms inside her costume.^[4] Kennedy described the vigorous training needed to portray Kai as well as enjoying the character's arc,^[5] and mentioned that the armor designed for the Spartans actually protected her when she tripped on-set.^[6] Kennedy became a fan-favorite for her performance as Kai-125, with one review calling her character the "best part" of the series.^[7]

In addition to her film and television roles, Kennedy has also provided voice acting in video games, with her most notable role being Lady Eadwyn in Assassin's Creed Valhalla. She has also voiced Hela in Lego Marvel Super Heroes 2, among other roles.^[3]