I have a split personality where one side of me is brutal and sadistic and the other is a goofy nerd. I call my inner nerd side 'Peter' and think of him as a separate person.
That's strange. Why do you think of him as different if he's part of your personality?
It makes the whole condition make more sense to me.
You should probably get some therapy if you have split personality disorder. You could cause trouble for yourself and others.
It's cool, I'm a pacifist, so I can control the other side. Plus, I even have superpowers from it.
I know you think you can control it now, but what happens if you slip up or if the other side takes over while you're asleep? Do you want to be a pacifist mind stuck in a cruel body that your other side controls? You really should consider getting help for your own safety.