Lexaeus
Lexaeus is number V in the Organization. He fought Riku shortly after the death of Vexen.
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 warrior, but with his last bits of strength, Lexaeus releases all of the darkness within him in hopes of overwhelming and consuming Riku. However, Riku is saved by King Mickey.
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