Ashura is a recurring villain from the SaGa series, appearing as the main antagonist in the first game and returning as a boss in the two sequels on the Game Boy and it's remakes on DS.
Makai Toushi SaGa
Ashura is the arch-fiend that acted as the major villain, he was responsible for commanding the four other fiends that antagonised the heroes throughout the story and was seemingly in charge of Paradise.
When the heroes confronted him Ashura was willing to make a deal with them, offering to share the world with them if they'd ally with him - the heroes refused and the arch-fiend fought them but was slain but the heroes are subsequently sent flying out of the tower after the battle via a trap. He is later revealed to have been created by The Creator to test humans.
Ashura appears as the first major boss fought in the game. He was originally a mere goblin who obtained the mystical Magi whose powers mutated him into a powerful monster, and now he sought to obtain more of these artifacts in order to obtain godhood: Ashura has managed to gain control over his own tower and a new band of heroes seek out his base to put a stop to his plans, taking on the arch-fiend's minions in the process.
Once the heroes reach the arch-fiend himself he taunts them, stating that his minions had already shrunk themselves and entered the body of the healer Ki to steal her magi (which she was somehow born with inside herself) he then states his intent to steal the heroes magi for himself but is ultimately defeated - at the end of the battle he has an ending quote of "No.. No!! ..I ..don't.. wanna.. die.." before he seemingly perishes and giving the heroes a large collection of magi as a result.
Ashura returns in SaGa III/Final Fantasy Legend III, using a strange disease to transform hapless humans into monsters and once again managed to get himself a stronghold in the form of South Tower. However the heroes of the story went after Ashura when rumors persistated that he had some Units belonging to the Falcon, a vessel that they used to travel through time. Ashura informed the heroes that the Units were no longer in his possession but fought them regardless alongside two Warrior henchmen.