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Dilandau Albatau is the leader of an elite group of Guymelef pilots called the Dragon Slayers in Dornkirk's army. He almost completely lacks self-control, compassion, and a conscience. His greatest pleasures come from fighting and destruction, and the joy he takes in burning things suggests pyromania. In battle, Dilandau pilots a red Guymelef with flight capability, stealth cloak, flame-thrower and liquid-metal Crima Claw capabilities. As the series progresses, Dilandau grows gradually less stable. While clearly disturbed in his early appearance, his insanity grows after he receives a cut on the face during a fight with Van Fanel.

Though he treats them very harshly, often slapping or hitting them for little or no reason, Dilandau is also emotionally dependent on the Dragon Slayers. After all of his men are killed, he becomes completely unstable and spends much of his time in an apathetic daze, only coming to life on the battlefield as he gleefully maims and kills. For their part, despite his harsh treatment, the Dragon Slayers are fanatically loyal to him, up to and beyond death.

Towards the end of the series it is revealed he is actually Allen's lost sister, Celena, who was kidnapped, brainwashed and mutated into a male through a series of fate-altering experiments. In flashbacks of his childhood, it is revealed that Jajuka was Celena's caretaker when she first arrived in Zaibach and became Dilandau's emotional anchor. As his mental state deteriorates, Dilandau's memories try to return and he briefly returns to being Celena, though she is stuck in a naive, childlike state. During this time, Celena is reunited with Allen for a short time, but the Dilandau personality reemerges. During a climatic battle with Van, Jajuka is killed protecting Dilandau. Before he dies, he tells Dilandau it's okay to be Celena again, triggering Dilandau to revert to his real self again. Celena and Allen are reunited again, and the Dilandau personality is not seen again.