I've recovered a li'l project of mine: a compilation of patches that unlock hidden characters in several fighting games for Game Boy. Not sure how many people will be interested, but just for preservation purposes... github.com/marcrobledo/...
GitHub - marcrobledo/takara-game-boy-fighting-character-unlocker: A compilation of patches that unlock hidden characters in several Game Boy fighting games made by TakaraA compilation of patches that unlock hidden characters in several Game Boy fighting games made by Takara - marcrobledo/takara-game-boy-fighting-character-unlockergithub.com