Pixel art takes a little more time, according to my own experiences. So don't feel too bad.
AND WOOOOAAAAAAA, I was thinking I'd be a Partisan/Chaperon combo, too (what coincidence)! At first I thought it'd be a really weird combo, but you + a bunch of other walls is a pretty legitimate tactic... if not freakishly O.P. 
Hmmmmm then why not some sort of a dilution system? I.e. if you specialized in two characters with good defense, then instead of getting the defensive boosts from both, then you'd just get the average of the two. Ohh! And there could be some sort of super-awesome class you'd get if you specialized in EVERYTHING and had super-boring stats and stuff! 
Ah, yeah. Naturally, if you focus in two (or more) classes, you won't be 100% in any. The game would probably have a points-distribution-based system.