A relatively new recruit to the Organization, courtesy of Xigbar, Marluxia is lord of Castle Oblivion and Sora's main antagonist in Kingdom Hearts: Chain of Memories. He is also referred to as the "Graceful Assassin". Marluxia is voiced by Tatsuya Kando in Kingdom Hearts: Chain of Memories and Shūichi Ikeda in Kingdom Hearts Re: Chain of Memories. He uses a scythe and his control over flowers to attack.
In Chain of Memories, Marluxia and Larxene conspire to overthrow the Organization by using Naminé to manipulate Sora's memories. He gives Sora his first set of world cards to proceed through the castle. He assigns Axel to eliminate Vexen when his plan to use the Riku Replica fails. Larxene fails to kill Sora and is eliminated as well. Marluxia is later confronted by Axel, who accuses Marluxia and Larxene of being traitors for conspiring against the Organization. Axel attempts to kill Marluxia, however, Marluxia returns to the thirteenth floor with Naminé, tricking Sora into fighting Axel for him. Seeing Axel defeated, Marluxia anticipates Sora's arrival on the thirteenth floor. He orders Naminé to erase Sora's memories, but she refuses. When Marluxia implies that he will kill her for disobeying him, Sora demands that Naminé erase his memories for her safety, as his promise will remain and he can protect her. Marluxia says that Sora would become just like the Riku Replica, but the Riku Replica surprises Marluxia, who then engages Sora. The two fight, but Sora realizes he has been fighting a replica of Marluxia. He later finds the real Marluxia, in a new form, and kills him.