Chuu is a demon and a formidable hand-to-hand combatant who first appears as the leader of Team Rokuyukai during the Dark Tournament. He serves as a rival to the protagonist Yusuke Urameshi before becoming a steadfast ally and friend. His background includes a notable act of heroism prior to the tournament, where he used his fighting skills to save his teammate Rinku from a gang of demon thugs, showcasing an honorable nature that exists beneath his rough exterior.

Physically, Chuu is tall and muscular with a distinct appearance. He has a long, electric blue mohawk, the ends of which are tied with red ribbons, along with a messy goatee and green striped tattoos beneath his eyes. His typical attire consists of a fur-lined tank top and boots, olive green pants, and a red sash belt. His personality is defined by his love of alcohol and battle. He employs a unique fighting style that becomes more powerful and unpredictable the more he drinks, often staggering into the ring as a deceptive ploy. When intoxicated, he is cocky and known to flirt with the tournament announcer Koto. However, this is a mask for a perceptive and adaptable fighter who possesses a deep-seated lust for intense combat, much like Yusuke.

Chuu's central role in the story occurs during his fight with Yusuke in the Dark Tournament. After exhausting their energy reserves, he proposes a "knife-edge death match," a brutal duel where both fighters stand with their heels on the blades of staked knives, unable to retreat. Despite losing the match and falling unconscious, Chuu honorably requests that Yusuke finish him off as per the death match rules. Yusuke’s refusal and offer of a future rematch solidify a deep mutual respect between them, transforming their rivalry into friendship. He later aids Yusuke and his friends by blasting a boulder out of their path, allowing them to escape the collapsing tournament stadium.

His key relationships include his mentorship and brotherly bond with Rinku, whom he often watches over and trains alongside. Following the Dark Tournament, Chuu develops a friendly rivalry with Yusuke, constantly training with the goal of eventually defeating him. During the Three Kings Saga, Chuu undergoes intense training under Genkai to increase his power. He enters the Demon World Tournament but instantly surrenders when matched against a powerful demoness named Natsume, on whom he develops an immediate crush. Despite her initial rejection, he vows to surpass her strength within two years. In an epilogue, he is seen training with Natsume, who acknowledges his rapid growth. Chuu demonstrates significant development in power, starting as an upper C-class demon. After training with Genkai, he reaches A-class, and following the tournament, he continues progressing toward S-class strength.

Chuu's notable abilities center on his Drunken Fist style, which relies on unpredictable movements and increased power fueled by alcohol. By drinking the potent demon sake Ogre Killer, he can enhance his demon energy, causing his aura to flare wildly and his physical appearance to change. He can mix this alcohol with his energy to fire a powerful, orange-colored projectile attack similar to Yusuke's Spirit Gun, which he can also expand into a larger version called the Ogre Boulder. He possesses immense physical strength, sufficient to shatter a mountain, which he often channels into powerful punches and a signature colossal headbutt. Chuu can also refine his energy into a barrier for defense and even achieve a limited form of levitation.