Sycophant: A person who flatters and ingratiates themselves with others.
Lackey: A subordinate or follower who obeys without question.
Yes-man: Someone who always agrees with authority figures.
Follower: One who blindly follows another's lead or opinions
Flatter or fawn over someone for personal gain.
Act subserviently to curry favor with authority figures.
Follow and support a powerful individual unquestioningly.