Use this kind of set up
Name: What is their real name?
Nickname: What do others call you?
Gender: Male/Female
Age: Please make this in standard years.
Mutation: What can they do? What are their limits?
Mutation weakness: Pick something that will nutralize their powers, or something that is required for their powers to work like, you have fire powers, but there must be an open flame for you to use it. Or like a kryptonite weakness kinda thing.
Alignment: Good/Neutral/Evil
Backstory: Where did they come from? Were they liked before their mutation was discovered? Did they live in a wealthy home, or did they live on the streets?
Appearance:A brief description or a picture will do.