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.
List of Mega Man characters
is the main antagonist of "Mega Man X3". Dr. Doppler is depicted as a Reploid researcher who supposedly discovered a cure for Maverick Reploids, and even founded a city, Dopple Town, in honor of it. When the supposedly cured reploids began causing riots in Dopple Town, the Maverick Hunters held Doppler accountable. After X and Zero defeats him, Doppler reveals that he was corrupted by the viral form of Sigma, who ordered him to create a new body for him. Eventually, Zero would learn that Dr. Doppler has the true antivirus, and applies it to his Z-Saber to finish off Sigma and get X and himself out of Doppler's exploding laboratory. (Alternatively, if Zero is injured, Dr. Doppler uses his own body as the true antivirus and sacrifices himself.)