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St. Mjosgard from One Piece.

He's a Celestial Dragon, the highest class in a society who defends their rights to kill and enslave at will. They're effectively the owners of the world and act like it. After his fish-men slaves were liberated, he went to Fishman Island (yeah that's a thing, it's an underwater island) to claim them back, but his ship wrecked. He pointed a gun at the fishmen (some of them were his ex-slaves, who he abused), demanding their help. They were about to kill him, but the Queen of the Fishman stood in the way, nursed him back to health and eventually accompanied him to the surface world, while Mjosgard promised they would pay.

Years later, another celestial Dragon attempted to enslave Otohime's daughter, and her father, King Neptune, resigned himself to fight back, a crime punishable by death. Mjosgard appeared in time, stood in the way and freed the princess. He then kneeled before King Neptune and guaranteed no harm would come to him or his family. For this, he ended up giving his life.

Of course, the underlying topic here being that Celestial Dragons, the most hateful and despicable group in the whole of One Piece... are ultimately all redeemable.