My favorite type of mind control is when the character only changes Just Enough to be evil/suit the controller's means Like an excitable and playful character additionally becoming sadistic, playing around with their foes Or an amplification of an existing trait, like a combative/eager to fight character becoming bloodthirsty
It's especially fun (and/or angst-worthy) when the changes aren't immediately noticable Like a character that's:
Smart
Not expressive
Affectionate, but only a few figured out how they show love
Becoming:
Smart
Not expressive
Heartless








