The following fighters are the only characters in the Smash series to appear in another fighting game:

•Snake appeared in Dream-Mix TV World Fighters as a playable character.
•Mega Man has appeared in the Mega Man Power Battle series, a few Capcom VS games (mainly the Marvel vs. Capcom series) and Street Fighter X Tekken (in his "Bad Box Art" form).
•Donkey Kong also appeared in Punch-Out!! for Wii as a boss.
•Sonic appeared as a playable character in Sonic the Fighters and Sonic Battle.
•Link appeared in the GameCube version of SoulCalibur II.
•Little Mac appears in Punch-Out!!.
•Ryu and Ken are main characters from the Street Fighter series.
•Cloud appears as a playable character in the Dissidia Final Fantasy series.
•Terry is a main character from The King of Fighters series.
•Kazuya is one of the characters in the Tekken series.
•The Kirby series has its own set of spin-off fighting games called Kirby Fighters.
•Charizard, Lucario, Mewtwo and Pikachu appear in the fighting game Pokken Tournament.
•Min Min is one of the characters in ARMS.