Ridley (Metroid)
One of Adam's final missions to Samus is to finish off Ridley, whom Adam fears might be more dangerous than the Metroids if left unchecked, and claims Samus is the only one capable of stopping him. However, Samus later discovers his corpse after he is killed, having had his energy drained by the Queen Metroid on the Bottle Ship. His mummified corpse turns up again in "Metroid Fusion" on the BSL station, after having apparently been removed from the Bottle Ship by the Galactic Federation and placed in a sub-zero storage room for further research (potentially into further bioweapon applications). It is later infected by an X Parasite, allowing it to gain the ability to transform into Ridley's likeness, known as . Samus later defeats the Ridley mimic and absorbs its Core-X, regaining her signature Screw Attack. What was left of the cloned Ridley's remains were destroyed along with the X when the BSL station crashed into SR388.
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.)