Ikebukuro is a small owl-like creature who serves as an assistant in the East Oizumi Academy Cosplay Club. He acts as a companion and helper to Delmo, a magical bunnygirl with powers to conjure and alter cosplay costumes. His duties include aiding club members with practical tasks like sewing costumes and ironing garments. Though incapable of verbal speech, others understand his communications through unexplained means. He occasionally judges cosplay competitions involving the club. His presence supports the club's operations by providing logistical assistance during costume preparation and event coordination.