✏️ Feel free to skip this if it's too long or you can't find a good space for it or you simply end unable to write on yourself but I think
"Too brainwashable for its own good" would fit quite well on any place on its body
this would be a perfect thing to write on its forehead while someone has it so tranced out of its mind that it can't even register the touch. maybe they draw all over it while it's in trance, so that when it wakes up it knows that it *has* been drawn on.
then you play a game of 'see how long it takes for it to realise that that's what's written on its forehead.'
alas, it's not entranced and it can't really write on its own face, so it's written it on its arm instead, in a place where it will keep seeing it, reinforcing that it's an all too eager hypnotoy
thank you for the ask task!