How could I forget The Revenge Of Shinobi? That game had quite a few unlicensed appearances of famous characters and was revised multiple times because of that.
Rambo:
Revised version:
Godzilla:
Revised version:
Batman:
Revised version:
Spider-Man:
Spider-Man didn't have to be revised in the original Western version because Sega had the Spider-Man license back then. When the game appeared on the Virtual Console, the license had long expired, so Spider-Man was changed to this:
Even the title screen had to be revised eventually because it featured an unlicensed cameo by Sonny Chiba:
Revised version:
Joe Musashi looks so sad
Rambo:
Revised version:
Godzilla:
Revised version:
Batman:
Revised version:
Spider-Man:
Spider-Man didn't have to be revised in the original Western version because Sega had the Spider-Man license back then. When the game appeared on the Virtual Console, the license had long expired, so Spider-Man was changed to this:
Even the title screen had to be revised eventually because it featured an unlicensed cameo by Sonny Chiba:
Revised version:
Joe Musashi looks so sad