I like it.
I find it very respectable that you put a well known character like the Castle Crashers and are willing to put it in your own style. I thought the hat and shield were pretty mishapen, plus there is no depth to his armor or whatever clothes he is wearing. It looks like he is standing sideways and is about to fall over. Maybe one of the Castle Crashers landscapes would look good too instead of the black background, but I like the blue fog surround him. He kinda looks like Toad from the Mario series in a way. Anyway, keep up the nice work!