Gentoku Ryuubi leads Seito Private School as the "Little Vessel." She is 17 years old in the manga and 18 in the anime, born June 23. Her appearance features green eyes and long brown hair typically styled in two side ponytails, standing 1.60 meters tall with measurements of 96-61-92. She consistently wears her Seito Academy uniform, including a neckerchief, and occasionally adds glasses. Gentoku embodies kindness and gentleness, fiercely protective of friends even without combat skills, often physically shielding them. Despite low intelligence and initial disinterest in leadership duties, she enjoys popularity among Seito's fighters. Her character holds a stark duality: her usual pacifism shatters when her dragon spirit awakens, transforming her into a merciless, sadistic force, smiling while brutalizing friend and foe alike. This dragon spirit first emerges in *Dragon Destiny* during Kyosho Academy's assault on Seito, triggered by contact with Shimei Ryomou's Dragon Jade. The uncontrolled violence against her peers forces her confinement in the academy basement. After the dragon's influence fades, she aids the mission to rescue Kanu Unchou, forging an alliance with Nanyo Academy sealed by exchanging the Dragon Jade. At the Battle of Red Cliffs, she masters her dragon spirit alongside Hakufu Sonsaku, combining their water and thunder elemental powers to defeat Sousou Moutoku. Her relationship with Kanu Unchou becomes central in *Great Guardians*, complicated by Kanu's romantic feelings, which Gentoku largely overlooks or misunderstands. Possessed by Genpou Saji through Ryofu Housen during a theme park incident, Gentoku helps subdue Seito's fighters until Kanu intervenes. Kanu nearly dies after Gentoku impales her, but Kanu's heartfelt confession breaks the possession, leaving Gentoku devastated by the harm inflicted. Their bond later mends when Gentoku gifts Kanu her favorite book as a token of deep appreciation. Demonstrating growth in *Xtreme Xecutor*, Gentoku embraces her leadership role more responsibly at Seito High School. This commitment manifests when she rescues an unconscious Bachou Mouki, offering her refuge to recover.