Hey you can make your dream come true by mugenizing them all (or make a full game called something like "flammableking's MUGEN Boxing Mania")!
Some more video game boxers:
Ashita no joe aka Tomorrow's Joe:
Street Fighter One (1) Mike:
TJ Combo from Killer Instinct, Rob Python from Buriki One and Joe Fendi from Fighting Layer:
Fatal Fury Axel Hawk, Michael Max, and King of Fighters Heavy D!:
All you can "box" here:
Descriptions here: http://www.deviantart.com/morelikethis/314305124#/art/Video-Game-Archetypes-Boxers-314292211?_sid=2d03bb57