Tsuzuku Ryudo, 19, stands as the second eldest of the Ryudo brothers and the Red Dragon King of the South. His draconic abilities command fire, electromagnetic energy, and nuclear forces, embodying elemental dominion. Despite his striking appearance and polished charm, which effortlessly draw admirers, he deflects attention with self-deprecating wit and humility. A pacifist at heart, he engages combat only as a last resort, relying instead on a sharp strategic intellect to orchestrate victories for his siblings during clashes.

Reserved and perceptive, he shares a bond of mutual trust with the eldest brother, Hajime, collaborating seamlessly on shared duties. His rapport with the third brother, Owaru, brims with lighthearted teasing, while he shields the youngest, Amaru, from harm through steadfast mentorship. Orphaned young, he resides under Hajime’s guardianship alongside their cousin Matsuri Toba, whose amiable management of the household contrasts her father Seichiro’s hostile dealings with the brothers.

Across novels, anime, and manga, Tsuzuku navigates dual loyalties: upholding his role as a dragon sovereign while yearning for ordinary life. He opposes threats like the Four Sisters and the Bulls, factions targeting his family’s draconic legacy. The Clamp manga spin-off briefly spotlights his humor amid Owaru-centric stories, though his core traits—alliances, tactical brilliance, and quiet resilience—remain unchanged across adaptations, untethered by expanded lore or deviations.