guilty gear style.

erza scarlet.
richter Belmont
honoka (doa5LR: just imagine her in GG style!)
marie rose (doa5LR: holy hell she'd rock! snappin' necks, arms and whatever joint she can get her little hands on!)
jacky Bryant (VF5:FR/DOA5LR although, he may be to epic for mugen...)
Zhou tai (DW8:XL just look up a video. though he'd probably play like Johnny... OH WELL!)
ramlethal valentine. (Guilty Gear Xrd SiGN/REVELATOR/REV 2. incase ya didn't hear, BAIKEN'S COMIN' BACK BABY! IT'S OFFICIAL!)
future trunks from super timeline with super saiyan blue rage form. (admit it, DB timeline is so F'ed now.)

and hell, i'm just gonna throw this out there. super saiyan rainbow vegito/gogeta because let's face it, it's gotta be the ultimate saiyan form! unless white would signify all power coming to unity... nah, i'd still go with rainbow!

TASTE THE RAINBOW! FIGHT THE RAINBOW!

LOL! "Ka... Me... Ha... Me... ROYGBIV!" followed immediately by the opponent saying "WHAT THE FAAAAAAAAGH!"