Lexaeus (レクセウス, Rekuseusu?) is one of the two members of the Organization in Kingdom Hearts: Chain of Memories that only appears in Riku's story mode. He is also known as the "Silent Hero" (静かなる豪傑, Shizuka-naru Gōketsu?) and he employs a large axe-sword, "Skysplitter" (破天, Haten?), able to break rocks and shake the area itself with his elemental power of earth and superhuman strength.[7] Lexaeus was originally one of Ansem the Wise's assistants, a guard named Aeleus (エレウス, Ereusu?, misspelled as Eleus in the North American version) who met Ven. The character was first voiced by Tatsuya Kando, who provided simple battle expressions for Chain of Memories.[23] For the Japanese releases of Re:Chain of Memories and 358/2 Days, he was replaced by Fumihiko Tachiki; Dave Boat voiced the character in the English releases.[13][25]

Lexaeus makes a minor appearance in Kingdom Hearts 358/2 Days, training Roxas before he leaves for Castle Oblivion. During the events of Chain of Memories, discovering Marluxia's 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. When they believe 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. In the original Chain of Memories, 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.[35] In Re:Chain of Memories, however, Riku is knocked unconscious by Lexaeus, only to be possessed by Xehanort's Heartless, who swiftly cuts Lexaeus down, the dying warrior lamenting his decision to battle Riku.[36]