* MarthDebutedInSmashBros:
** Saki Omokane, a character who would've remained in an obscure [[http://www.hardcoregaming101.net/quiznanairo/quiznanairo.htm Japan-only trivia game]] had it not been for her appearance. She would later join the Vs. Series in ''VideoGame/TatsunokoVsCapcom''.
** Most fans had no clue who [[VideoGame/{{Cyberbots}} Jin or Devilotte]] were when they made their debut in this crossover.
* WhatCouldHaveBeen: An [[OriginalGeneration original]] JokeCharacter, Tomichin, was originally planned as one of the Assist Partners, but couldn't make it into the game. [[spoiler:He is also an {{Expy}} of [[Series/SesameStreet Bert]].]]
** Iron Man was slated to be a part of the roster, but rights issues prevented his inclusion much like ''VideoGame/MarvelSuperHeroesVsStreetFighter''. War Machine was selected to take his place as a PaletteSwap, and Iron Man would not rejoin the series until ''VideoGame/MarvelVsCapcom2''.
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