Auron

Auron is a character in Kingdom Hearts II, originally from Final Fantasy X. Hades becomes increasingly frustrated in his attempts to defeat Hercules, since the hero kills every opponent the Lord of the Dead throws at him. At Pete's suggestion that he "send somebody already dead and save him the trouble," Hades decides to bring out the "mother of all bad guys." He goes to the deepest dungeon in the Underworld and summons Auron, offering to let him out if he kills Hercules. Auron declines and insults him, derisively telling him that "This is my story, and you're not part of it." Hades, in a rage, attacks him just as Sora comes in, and the group escapes, battling legions of Heartless and Cerberus along the way. On the way, Sora complements Auron's fighting skills and asks if he is a hero, though Auron denies being a hero. He asks Sora if he needs a guardian, but Sora politely declines. Soon after escaping Cerberus, Auron disappears. Sometime later, Hades seals Auron's free will into a statue and forces him to fight Hercules. But once again, Sora comes through and reclaims his soul, and the four of them defeat Hades. Later, Auron repays Sora by giving him the Guardian Soul Keyblade. Auron is seen during the credits fading back into pyreflies (the essence of a person's soul in Final Fantasy X) after witnessing the restoration of the Olympus Coliseum.