Fighting games have proven to be the ultimate "crossover dream turned into a reality" scenario since 1993. And since then, the best fighting game guest characters have become a hot topic amongst the FGC.
Fatal Fury Special kickstarted the ongoing trend of fighting game guest characters with the surprise appearance of Art of Fighting's Ryo Sakazaki as a special boss challenge/playable character. And in the years since, some of the most popular and obscure fighters have spread out their roster by adding in outside participants. What makes that aspect of fighters so interesting is the fact that guest characters have not only been lifted from other fighting games - they've also been taken from non-fighting games, TV shows, and movies. The best fighting game guest characters tend to add that extra bit of pizzaz to any fighter they're added to.
For this list, we're going to acknowledge 40 of the greatest fighting game guest characters of all time. And for some of these picks, we just had to show love to the entire guest ensemble that made their presence felt in certain fighters (we're looking at you, Mortal Kombat!).