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.
Metroid
Mother Brain was also the primary villain in the "Captain N: The Game Master" TV show. A Metroid-lookalike enemy, called the Komayto, was encountered by Pit in "Kid Icarus" for the NES. In "", a fighting game developed by Team Ninja for the Nintendo 3DS, one stage is a replica of the arena in which Samus fights Ridley in "Metroid: Other M" and features both as assist characters; Samus, however, is not featured as a playable character in "Dimensions", as Team Ninja's Yosuke Hayashi stated in an interview that "it would be better to let her focus on her job rather than kicking everyone's butt in ["Dead or Alive: Dimensions"]". A Wii U launch game "Nintendo Land" has a mini-game based on the series called "Metroid Blast".