Addicted to YA discussion

I am at the point where he looses complete control. the out of control form is has a crazed personality that is always laughing and unpredictable. I am trying to decide how he will change. Should he change form to a black monster. the monster has no eyes, a smile the reach from ear to ear,long lizard tail and it can be used like a monkey, and constantly shifting skin. or should it be a masked figure. the mask is like a Japanese demon mask with no eye and a long smile,a cloak of black mist. in the mist he can get any type of weapon he need. when you choose one, I would appreciate if you could give me a rumor name for this form when they people first see it.