Another idea I had for Super Sonic would be similar to Bison's Psycho Crusher, just have him go gold, vanish and then charge right into the opponent.  It can do a lot of chip and be really unsafe but also work really well for punishing dumb stuff, and make it link comboable like POTS Bison did.

That could work. Or, an idea I had was to make it work like a semi-controllable Final Psycho Crusher like move. Having Super Sonic fly back and forth about 4-5 times, while holding up or down during his flight attacks could alter his pattern dependent on which direction you're holding of course. Essentially in SSBB, this is all you'd do anyway when you get a Final Smash orb with him. Fly back and forth, knocking people off the stage. I feel though for a MUGEN standard, he shouldn't have full control. That'd make it sorta cheap. Not travel as fast as Bison's FPC, but just like that move, he can't stop his forward momentum. He'd also be completely invulnerable during it, so, I think that would balance it out very well. Just another route you may be willing to take and you'd only need a flying animation really.