Red Mist surviving, becoming the super-villain was always planned, but the idea was that he was going to be a more minor character in the first film. […] the second movie, it’s going to get very, very dark what goes on with him…So the idea of McLovin’ and the fun Red Mist doing something horrible is genuinely quite disturbing when you see it happen.
Scriptwriter Mark Millar
The movie Kick-Ass 2 will be the rise of a super villain then! I completely dig this idea!