Aiolia du Lion serves as the Gold Saint of Leo, guarding the fifth temple in Athena's Sanctuary. He is the younger brother of Sagittarius Aiolos, branded a traitor for allegedly attempting to assassinate the infant Athena. This stigma profoundly shaped Aiolia's early life, driving him to prove his loyalty to Athena and cleanse his family's honor. During the Sanctuary arc, Aiolia initially obeyed the false Pope's orders to eliminate the Bronze Saints. He confronted Pegasus Seiya in Japan but halted his attack upon witnessing the Sagittarius Gold Cloth protect Seiya. A vision from his deceased brother confirmed Athena's true identity, leading Aiolia to pledge allegiance to her. However, the Pope's "Demon Emperor's Delusional Fist" later brainwashed him into opposing the Bronze Saints during their assault on the twelve temples. Cassios's sacrifice during Aiolia's battle with Seiya broke the spell. In the Hades Chapter - Sanctuary OVA, Aiolia fought alongside other Gold Saints against revived specters and the traitorous Gold Saints Saga, Camus, and Shura. He witnessed Virgo Shaka's death by the Athena Exclamation technique and reacted with fury, attacking the trio. He later participated in a standoff involving dual Athena Exclamations, defused by the Bronze Saints. Aiolia, alongside Mu and Milo, confronted Wyvern Rhadamanthys in Hades' castle but was overwhelmed due to the castle's power-dampening effect. Imprisoned in Cocytus, he was later revived by Athena's cosmos. In the finale, he joined the collective sacrifice of the twelve Gold Saints to destroy the Wailing Wall, enabling the Bronze Saints to reach Elysium. The spin-off *Soul of Gold* depicts Aiolia resurrected in Asgard, where he allied with the servant Lyfia to investigate Loki's corruption. He temporarily awakened the God Cloth form of his Leo armor and was chosen to wield Odin's Robe. Empowered by Athena's divine blood and united with the other Gold Saints in their God Cloths, he defeated Loki before vanishing, leaving Lyfia with a protective necklace. In *Episode G*, set years before the main story, Aiolia dyed his naturally blond hair red to distance himself from his brother's legacy. He developed the "Photon Burst" technique to honor Aiolos and protect him. This spin-off explores his conflicts with Titans like Koios and Cronos, highlighting his belief in humanity's potential and his role as a reincarnation of Achilles. His younger self also appears in *Episode G Assassin*, where his soul merged with Zeus, retaining memories from another timeline. Aiolia's combat prowess centers on light-speed attacks fueled by the seventh sense. His signature techniques include Lightning Plasma, delivering up to 100 million punches per second to create a net of light; Lightning Bolt, firing an energy projectile through a vacuum created by his fist; Photon Burst, releasing photons that bypass defenses to explode internally, comparable to the Gemini Saint's Galaxian Explosion; and the forbidden Athena Exclamation, combining three Gold Saints' cosmos to rival the Big Bang. His Leo Gold Cloth, modeled after the Nemean Lion slain by Hercules, grants resistance to extreme cold and enhances his durability. Across all media, his character arc emphasizes unwavering loyalty to Athena and redemption of his brother's legacy through sacrifice.