Thanks for the replies. It's nice to know that someone cares. My evil alter displays traits found in people who are without empathy, remorse or any form of consideration of the feelings or well being of others.
He/It is also very cold, power-hungry, anti-human, has a seemingly endless supply of hate, intense anger and resentment, is extremely arrogant, aspires to become a powerful tyrant, admires other tyrants in history, believes himself to be a god and a mighty ruler and the list just goes on. I have had to come up with ways to try to prevent him from taking control or being triggered to where I go from being me to becoming him but, lately he has been getting out anyway. I'm just thankful that he hasn't physically hurt anyone in a very long time. I think he delights more in hurting people emotionally anyway and keeping them wondering what will come next.
I don't like to talk about what he's really like because I don't want to be seen as a dreadful person who should be avoided. Me and this personality are as different as day and night. We are very opposite of one another. I have other personalities who's job it is to counter him and prevent him from doing any kind of serious damage be it emotional or physical. Sometimes it takes me and three others just to hold him off and it didn't used to be that way at all.
I've been in a power struggle with him all of my life and resisting him lately has made me very weary. There's more but, I'm afraid to talk about it.