super smash bros 64 :3 maybe my Bowser from Sm64 fits here:
can get ingame pics on it tomorrow lol maybe even Pink bob-omb buddy but dont know if you want "Custom" character that's were not playable in SSB series
So I'm taking that you've imported Bowser into Brawl, and are just working on any glitches and errors.
*******************Double-post merger*******************
So this would be epic to be done Mario (SM64 model) Done Luigi(SSB model)
Or you could do Vl-Tone aka Starxxon's Luigi model hack for SM64. Of course that one would have to be ripped, because I dought that the Model's Resource does hacks, correct me if I'm wrong about that. It would be funny if you find out how to import that over Mario, then people could have laughs at Luigi being capless while playing Brawl. When Luigi is capless his head swells, and disconnects from his body, check out Why Luigi Wasn't in Super Mario 64 (Machinima) for more details.