Wataru Hibiki studies at Yumenosaki Academy as an idol in the unit fine under STARMAKER PRODUCTION. Discovered as an infant floating down a river, he was adopted by an elderly couple under unclear circumstances. This upbringing fostered deeply ingrained insecurities, driving him to master increasingly complex magic, songs, and dances to entertain others and prevent abandonment. He eventually accepted the "genius" label while viewing himself as non-human. Childhood pressure to constantly innovate culminated when an audience rejected an advanced trick as incomprehensible, intensifying his fears of inadequacy. Physically, Wataru is notably tall with pale blue hair fading to vivid blue tips, worn long past his back in a small bun featuring a braided section secured by a maroon band. His light purple eyes enhance an androgynous appearance. He wears the Yumenosaki uniform distinctively, often draping the blazer like a trench coat. Onstage, he dons fine's regal white-and-gold suit. Offstage, his casual wear includes floral-print shirts or layered maroon and black outfits. His personality is theatrical and enigmatic, marked by flamboyant gestures, loud laughter, and a love for surprises and magic. He frequently assigns nicknames, claiming disinterest in real names, though he makes exceptions for close associates like the Five Eccentrics. Despite seeming detached, he maintains hyperawareness of his surroundings to prevent others from growing bored—a performative facade rooted in childhood trauma, with rare vulnerability surfacing during discussions of his past. He cultivates the persona of an "evangelist of love" and entertainer, yet exhibits sternness while mentoring juniors like Tori Himemiya through rigorous training to hone their skills. Key relationships shape his development. He shares mutual admiration with Eichi Tenshouin, who helped bridge his emotional distance after the War Era. Eichi initially envied Wataru's talent but grew to rely on him emotionally, culminating in reciprocal confessions of love and trust. Within fine, Wataru affectionately teases Tori (calling him "princess") while earning respect through mentorship; Yuzuru Fushimi observes a "logic" beneath his eccentricity. As a former Five Eccentric, Wataru considers Shu Itsuki a best friend, collaborating on theater despite differing philosophies—Shu sees himself as an artist, Wataru as a performer. He also connects with Hiyori Tomoe of Eden through magic practice and shared performances, acknowledging potential friendship under different circumstances. His abilities span stage acting, ventriloquism learned from Shu, and hypnosis beyond idol performances. He keeps at least ten pet doves for magic acts, naming them theatrically (e.g., Jeanne d'Arc, Gilles de Rais). Trivia includes walking on water for fifteen meters and claiming his sentient hair reacts to his emotions. His surname "Hibiki" (echo) and given name "Wataru" (ford) combine to mean "reverberate," reflecting themes in his solo songs. Wataru's character arc progresses from isolation to forging genuine bonds. Initially disinterested in fine and distancing himself via nicknames, he gradually embraced the unit as family, influenced significantly by Eichi. Post-graduation, he pursued acting but reaffirmed loyalty to Eichi and fine, gifting his performer's mask—representing his persona—to Eichi to integrate his fractured identity beyond the "nameless child" and the "mask."