Ruuan Keikounitten manifests as a sun spirit when Tasuke Shichiri gazes into the Kokuentou kaleidoscope artifact sent by his father. Her core purpose is to bring happiness to her pure-hearted master, creating an inherent rivalry with Shaorin due to their sharply contrasting duties. This divergence frequently sparks comedic or destructive clashes as their interpretations of Tasuke's wellbeing collide. Physically, Ruuan possesses dark green hair, lilac eyes, and a notably mature, attractive appearance. Her age is inconsistently documented, variously cited as approximately 700 or 1,652 years old. Despite her ancient origins, she adapts surprisingly quickly to modern Japanese society compared to other spirits, though she lacks proficiency in domestic tasks. Ruuan's magic centers on the Kokuentou, enabling her to animate inanimate objects into creatures called Youtenshin. These entities carry out her whims, often resulting in chaotic or hazardous situations as she pursues her happiness-granting mandate. Characterized as boisterous, flamboyant, and openly expressive, Ruuan actively pursues romantic and physical intimacy with Tasuke through direct advances. Her bold approach starkly contrasts Shaorin's reserved demeanor, fueling their ongoing conflict, and her persistence in these overtures remains consistent across manga and anime. In the manga continuity, Ruuan secures employment as Tasuke's homeroom teacher to maintain proximity, leveraging this position to further her romantic objectives while nominally fulfilling her duty. The introduction of Bananchiten Kiryuu, an earth spirit specializing in rigorous training through object enlargement, impacts group dynamics. While Kiryuu assumes greater prominence later, Ruuan continues contributing to comedic situations and romantic rivalry without significant alteration to her core motivations or personality. Her interactions extend to Kouichirou Endou, a classmate infatuated with her maturity, though his attentions remain largely unreciprocated as her focus stays fixed on Tasuke. Across all official media—the original manga, television anime, and Denshin Mamotte Shugogetten OVA—Ruuan's fundamental traits persist. She remains a relentless romantic pursuer, a source of magical chaos via object animation, and a counterbalance to Shaorin's protective nature. Her development manifests primarily through deepening emotional investment in Tasuke rather than substantive changes to her role or personality.