Marluxia

"Drown in the heart-lorn world of nothingness. I shall scatter your heart into the empty winds."

Marluxia is the primary antagonist of the video game Kingdom Hearts: Chain of Memories. He is a member Organization XIII and controls the power of flowers, which represent death as opposed to how they represent Cure magic in the games for all the other characters.

Chain of Memories
After the events of the first game, Sora, Donald, and Goofy are wandering a long road. In the middle of the night, Marluxia appears, with a hood over his head, and leads them to Castle Oblivion. Once inside, he takes all of their memories, and puts them into cards, weakening the party. He then teaches hem how to use the cards, and then leaves after giving them a card that allows then to revisit a world from their memories. As the game goes on, it is discovered that Marluxia has gotten several members of the Organization, Axel and Larxene to help him conspire against the leader of the Organization, Xemnas. To do this, he wishes to use Naminé to twist Sora's memories, turning him into a slave of the Organization, so that the power of the Keyblade could be theirs. However, Larxene is killed by Sora, and Axel betrays him, leaving him the last person in the conspiracy. Sora makes it up to the floor with Naminé, and after a short talk Marluxia reveals himself, and demands that Naminé use her powers to crush Sora's heart, but Naminé refuses, and Marluxia fights Sora. Sora is able to overpower him, and he flees into the highest room in the Castle, awaiting Sora with a reaper machine to help him fight. After that he fights Sora with a angel like nobody, which is the truth of his powers. In the end, Marluxia still falls at Sora's hands.

Kingdom Hearts II: Final Mix+
Marluxia appears as a special kind of Nobody, called an Absent Silhouette, because he died in Castle Oblivion. Fighting him is optional. A data replica of him also appears as an optional battle in Hollow Bastion.

358/2 Days
Marluxia appears as a playable character in Kingdom Hearts 358/2 Days, and teaches Roxas a few things about fighting.