Those do look great. As far as styles, this is what i think.
Mike - A balance between Balrog and Dudley styles
Lee - Goro Daimon would be a good style for him
Retsu - Similar to Lei Fei from Virtua Fighter 4 or Takuma from King Of Fighters
Geki - Similar to Kage from Virtua Fighter 4 or Hanzo from World Heroes 2 Perfect
Joe - A balance between Ralph and Clark from King Of Fighters
Nice, here's what I was thinking:
Mike - A cross between Balrog and Yamazaki. Yamazaki's serpent slashes with Balrog's dashing punches and a move like Cody's where he can lean out of the way. A more toe to toe version of Balrog.
Lee - A crazy drunk character who likes to jump and roll around. He has a dashing punch like Terry Bogard and a flying kick like Kim Dragon from World Heroe's. He can also do a rolling punch as a counter move and a move like the one Gambit has where he can bounce off walls.
Retsu - A counter based character with no projectiles or shotokan type moves. He has defensive counters for strikes and a rush punch like Gouken's to counter projectiles. He should NOT have any fire balls or hurricane kicks or dragon punches. We have too many of those already.
Geki - Strider's punches and Guy's kicks. He can also teleport and throw stars, sort of like Rolento's stinger move and he has a grapple move and a move where he can rush forward and do a jumping kick.
Joe - Sort of like Dee Jay but with no projectile.
But I want to try and make them their own character. I really don't want Retsu to be another shotokan or Lee to be a head swap of Gen and/or Yun/Yang.