Anita from the Darkstalkers series is a playable character exclusive to the Japanese version of the game. She was originally used only for testing purposes, but was soon added in the home console versions of the game. With the use of hacking tools, she can be playable in the U.S. version, although she lacks a name tag, quote, character portrait and ending, who instead borrows everything from Thanos.

In addition, Anita's moveset is glitchy and features other cameos such as Akuma from Street Fighter, Mei Ling and Donovan from the Darkstalkers series.
Contributed by Tuli0hWut