Deadpool is originally a member of The X-Men, but in the movie he's not (although 2 X-Men help him). After he find out he had terminal cancer, he decided that he wants to get 'fixed', but instead of that they expirimented on him, he became wounded from head to toe and something else happened, he got superstrenght and instant regeneration. Then he decided to become... a.. superhero (this was a very very short version of the movie).
Deadpool is created by the Marvel Comics and has been a success ever since.
I'm planning to make more Marvel (and DC) themes, maybe give me some feedback or ideas in th comments.