Mmm, I'm new too, but I kind of got the opposite problem. I can't stick to one character, instead I just play around with all of them (because they are all so fun to play with...well, besides Carl:arg:).
The result? I don't know a single combo beside ABC, and I I can't remember half of all the specials that exist in the game, meaning I usually lean on a singular, repetitive strategy throughout the whole fight:eng101:
Moral of the story? Specialize if you like winning:kitty: