Number 5 of Organization XIII
Also known as the "Peaceful Giant"
Lexaeus is a well-built, muscular fighter in Organization XIII's ranks. Lexaeus is one of the two members of the Organization in Kingdom Hearts: Chain of Memories that appears in Riku's story only. He employs a large tomahawk and the element of earth in battle.
Lexaeus, along with Vexen and Zexion, are older members of the Organization who are less than pleased when they are forced to submit to the will of newcomers like Marluxia. When they realize the Lord of Castle Oblivion plans to overthrow the Organization by capturing and manipulating Sora, Lexaeus and Zexion decide to capture Riku and use him in the same fashion to counter Marluxia.
Lexaeus seems to keep an eye on events unfolding in the higher floors of Castle Oblivion and he is the one that informs Zexion that Axel has killed Vexen. When it became dangerously apparent that Sora might fall into Marluxia's grasp, Lexaeus confronts Riku directly, trying to convince him to open himself up to the power of the darkness in his heart. Riku refuses to give in and Lexaeus attacks him. In a very close battle, Riku manages to defeat the brute, but with his last bits of strength, Lexaeus releases all of the darkness within him in hopes of overwhelming and consuming Riku. However, King Mickey protects Riku. His original name was Elaeus.
In the Chain of Memories manga, there is a gym in the lower levels of Castle Oblivion where Lexaeus spends most of his time.
He is also voiced by Tatsuya Kando in Kingdom Hearts: Chain of Memories.
Lexaeus, much like the other characters from Chain of Memories, are only included in one cutscene and a journal entry in Kingdom Hearts II.