There is evidence in the code of the arcade version that the two boss characters, Huitzil and Pyron, may have been planned as playable at one stage of development. There is an alternate color scheme for both of the characters that shows up if you are playing a mirror match, both characters are able to be played in Arcade mode though hacking (though Pyron can't fight the final boss due to a bug), both of the characters have their own endings, which are the exact same as their endings in the sequel, "Night Warriors: Darkstalkers' Revenge", though in a more unfinished state with the ending text just repeating "A" and the music not playing like it should.