Maybe you get members to help you on this, I'll be glad to.
There should be a health percentage on characters, say like you start with 1OO% until another char takes it down to 85%. Certain char should have certain strengths, but standard attacks should be like 5%, 2nd 10%, 3rd 15%, and special 25 or 3O%, lets keep math simple. Lets have 15OMP too.

I call Spidey!! I was gonna call Dead Pool but I couldn't resist bring peoples hopes down by picking my buddy Spider Man.