Ridley (Metroid)
Often considered one of the most memorable Nintendo villains, Ridley has been a mainstay of the series, having appeared (through various incarnations) in almost every "Metroid" game to date (all but "", "Metroid Prime Hunters" and ""). He has also appeared in the "Super Smash Bros." series, however, he had not been made a playable character until "Super Smash Bros. Ultimate" in 2018, making it also the first game overall to have Ridley as a playable character.
Marvel: Ultimate Alliance
"Marvel: Ultimate Alliance" features over 140 characters, and in addition the heroes battle evil versions of both themselves and other heroes throughout the game. Some heroes also appear as a villain under mind control, such as Jean Grey. In game each character has a set of four alternate costumes however three of these costumes must be unlocked. However, some of the characters costumes are also other superheroes in the Marvel Universe. This includes Iron Man as War Machine, Thor as Beta Ray Bill, Spider-Woman as Spider-Girl and Julia Carpenter from the Secret Wars, Ghost Rider as Phantom Rider and Ms. Marvel as Sharon Ventura. Also, there are various upgrades that can be attached to characters for boosts in power, speed, defense, etc. Nintendo characters Link from The Legend of Zelda and Samus Aran from Metroid were to appear in the Wii version of the game, but were cancelled due to being presented to Nintendo in the PS2 version.