Peridot would keep him most where I'd want him to be, I think. Otherwise he'd be far drastically changed since most teams are less forgiving of crazy it feels to me. Perhaps Iolite or Carnelian would have been all right, though they were added afterwards by a larger number of time. Mukuro is extremely flexible and it depends on how people . . . bother with him, really. In some ways if you have patience and stay by him he'll change for you, I guess. He is, in the end, more of a dependent personality than independent.

Itachi's Personae Opinions?