In short he is a human that has a scp that when someone touches it he take's over there body and if he does not touch the scp will he is in the body he will not have control of the person but the person is alive but they can't do anything. not even thing. And if he touches it for 30 day's he controls them forever and he can control other people at the same time, However because it make's him in a way immoral he has gone insane and does some crazy stuff. That's the simple and short way to say it. But I skipped some part's about it.