EX Billy Kane (EXビリー・カーン) is a humorous interpretation of Billy Kane, appearing as a secret character in Real Bout Fatal Fury Special. Though an EX Billy does appear in The King of Fighters '98 and The King of Fighters '98 Ultimate Match, he retains the personality and storyline of his original self, appearing only as a character with alternate moves from his Real Bout Fatal Fury 2 incarnation.