Terra (Mega Man)

Terra, is the leader of the Stardroids. He appears in front of Mega Man in the beginning of Mega Man V, and defeats him as even a charged shot from Mega Man's Super Mega Buster could not faze Terra due to his extraterrestrial origin. His goal was to power the Dark Star and kill Mega Man.

History
After the defeat of the first four Stardroids, Terra sends Dark Moon to attack Mega Man and moves to space, where he prepares an attack against Earth. Mega Man travels to space to destroy the four stations. After the defeat of the second four Stardroids, Terra gets angry that Mega Man had ruined his plans. He fights against Mega Man to redeem himself from his master Dr. Wily, but was defeated.

In Rockman Gigamix
In the manga Rockman Gigamix, the Stardroids are powerful space robots that attack Earth, destroying several robots in the process. To power Dark Moon, he challenges and defeats Mega Man in combat, providing Dark Moon with despair from the people. Eventually, a repaired and upgraded Mega Man is able to destroy him, but his own despair and hatred provides the energy to bring forth Sunstar.