The style looks fine, but I'm unsure about the animations for the sprites. Being that I want to become a game artist/designer/prorammer, I might draw Uzuki, Rin and Mika in a fighting game style. I don't know whether it should have a high school theme or use some of their SR designs. I'm getting excited 
I've played some chibi fighters before (Anything from the NGP, VG Max, Pocket Fighter, etc.). My concern now is that my style may not be consistent like the given examples.
Also, what I thought was for some characters, I'd just use my own custom designs for them. What do you think?