Which word is used for a person under the control of another?

backscratcher, backslapper, bootlicker, brownnoser, dependent, doormat, fan, fawner, flatterer, flunky, follower, groupie, hanger-on, lackey, parasite, puppet, slave, stooge, subordinate, toady, yes-man/woman, yes-person

Sychophant

Minion