A Referee has appeared in every Punch-Out!! video game to date. Interestingly, in the early Nintendo Entertainment System games, Mario was the referee. In the Punch-Out!!revival for the Wii, developer Next Level Games introduced a fairly traditional character to replace Mario, who they claimed didn't fit in with their version of the game (nevertheless, Donkey Kong, a character from the Mario universe, appears as a fighter).
The ref on the flier of Punch-Out!! in arcades.
The ref in the two arcade Punch-Out!! games.
The ref that appeared on the boxart of MTPO!!, but not in the game.
The alternative referee on the Featuring Mr. Dream box.