What I mean is more of what @
Cutie Gwen
was getting at. MAYBE the major Wonderful Ones show up in the moveset...or better yet they act as Custom Moves.
OR BETTER YET...make a few separate Wonderful Ones as separate costumes like the Koopalings, and make the custom moves the separate colors. Or just make it Wonder Red, Wonder Blue and Wonder Green with different color costumes. Or don't do any of that, make Wonder Red have R,B,G,P,Y,W,B,O as his different colors, and give him Red, Blue and Green's attacks as Custom Moves.
As far as playing, I would say he'd be a risk/reward character. The bigger your fist/blade/gun, the slower you move, and vice versa.
At least those are my ideas.