Hyôga du Cygne, known as Cygnus Hyoga, hails from Siberia. Born to Japanese billionaire Mitsumasa Kido and Russian mother Natassia, he lost his mother in a shipwreck at age six. This tragedy deeply traumatized him and drove his ambition to become a Saint to reach her sunken grave. Rejected by his father, Hyoga was among one hundred orphans dispatched globally by Mitsumasa Kido to train as potential Saints, ultimately assigned to Siberia. Trained by the Gold Saint Aquarius Camus in the manga, he mastered cryokinesis by controlling atomic movement via his Cosmo. The 1986 anime adaptation depicted the Crystal Saint as his direct mentor, with Camus serving as his master's mentor due to narrative shifts. During training, Hyoga attempted an early dive to his mother's ship, triggering a rescue by fellow trainee Isaak. Isaak lost an eye and was presumed dead saving Hyoga, intensifying Hyoga's survivor guilt. Initially detached and rational, Hyoga entered the Galaxian Wars under Sanctuary's orders to assassinate Bronze Saints, fueled by hatred for the Graad Foundation and his father. Bonding with other Bronze Saints—especially during clashes against Phoenix Ikki—he abandoned his mission, pledging loyalty to Athena and his comrades. His emotional core, centered on his mother's memory, transformed from a weakness into a strength. In the Sanctuary arc, Camus sank Natassia's ship deeper, spurring Hyoga's rebellion. He faced Camus twice: first surviving entrapment in the Freezing Coffin with Shun's aid, then defeating Camus in the Aquarius Temple using the mutually fatal Aurora Execution until Athena revived Hyoga. During the Asgard arc (anime-exclusive), Hyoga battled God Warriors like Merak Beta Hägen and Megrez Delta Alberich, elevating his Cosmo to the Seventh Sense. In the Poseidon arc, he confronted illusions of Camus created by Mariner General Lyumnades Caça and later fought Kraken Isaak, now a Mariner General, reconciling their past while destroying the Arctic Ocean Pillar. In *The Hades Chapter - Inferno*, Hyoga entered the Underworld awakened to the Eighth Sense, enabling his soul to retain combat abilities among the dead. He shielded Athena's Saints from the Judge Minos, whose assaults initially overpowered him. After his cloth shattered, Athena's blood revived it into the God Cloth. Hyoga aided in defeating the gods Thanatos and Hypnos in Elysium, channeling his Cosmo alongside others to empower Athena's final blow against Hades. Hyoga's cryokinetic abilities evolved significantly. Diamond Dust fires ice shards by freezing atmospheric moisture, later refined to target vital points. Freezing Coffin/Kholodnyj Smerch encases foes in ice, manifesting as ice tornados and walls. Aurora Execution releases absolute-zero cold from clasped hands, later achievable without gestures. His resilience grew to withstand absolute zero, dimensional distortions, soul manipulation, and divine curses. The Eighth Sense granted resistance to Underworld laws, age manipulation, and existence erasure. With the God Cloth, his power reached multiversal levels, enabling feats like space-time manipulation. Hyoga shares deep connections with fellow Bronze Saints, notably Andromeda Shun, whom he credits for saving his life in Sanctuary. His relationship with Isaak shifted from guilt to mutual respect during the Poseidon conflict. Across spin-offs like *Soul of Gold* and *Next Dimension*, he reappears in pivotal battles, with specific *Inferno*-era developments aligning with his core arc.