I admit that this seems more like a typical submission, but there's really nothing wrong with it. It's been awhile since I've seen those Castle Crashers guys. I was never even good at the game we had here. I think I recall that little guy. If nothing else, I'm glad he's being attacked. Chibi's such a funny word.
You seem to represent all the Castle Crashers well. I think you could work with the background wallpaper. It just looks kind of primitive. That guy's a knight too? No room for the brown knight here!