manipulator
noun
[ məˈnɪpjʊleɪtə ]
• a person who controls or influences others in a clever or unscrupulous way.
Similar:
exploiter,
puller of strings,
user,
manoeuvrer,
conniver,
intriguer,
puppet master,
puppeteer,
wheeler-dealer,
operator,
thimblerigger,
• a person who handles or controls something skilfully.