Riku Kin stands as one of the Ten Elders governing the Ryukozan sanctuary, a position of considerable authority within its hierarchy. He shares a close, established friendship with Rou Tenshi, the Celestial Priest, while simultaneously holding undisclosed connections to the antagonistic group Zensei, suggesting layered allegiances or a hidden past influencing his actions. His background marks him as the last known survivor of the dissolved Sanichimon Sect, a status implying profound personal loss preceding the series' events. He inherited power from his best friend, though the specifics of this transfer remain unelaborated. Part of his motivations involve targeting the coveted Eight Secret Arts, central to Outsider power dynamics. During the Raten Tournament, he strategically offered his secret art, the "Records of the Stairway to Heaven" (tsūtenroku), to the winner—a maneuver later revealed as a calculated ploy to lure Zensei operatives seeking powerful techniques. This positioned him as a key participant in the Ten Elders' broader scheme to expose Zensei. His known abilities stem from Sanichimon Sect teachings, primarily the Gyakusei Sanjuu technique, alongside specific Shouitsu style (Gorai Fujuu) and Furoku style variants, though their precise mechanics are not detailed. His role extends beyond ceremony; he actively shapes the tournament's strategic underpinnings and the unfolding conflict against Zensei through his connections and the bait he provided.