Goro Fumonji belongs to the B6 group within Klasse 3-E at Seitei Gakuen. He exhibits a flamboyant and theatrical personality, frequently embracing exaggerated feminine mannerisms. This includes a demonstrated interest in cross-dressing, reflected in his theme song "Romantic Metamorphoze" centered around women's clothing. He forms the unit pairing "Sapphire Disc" with Mizuki Madarame. Within the school, he is a member of the challenging Class X, contributing to the group's collective lack of academic focus and disruptive behavior that poses difficulties for the teacher. His vocal performance features in the third ending theme song "Seishun (Wonderful) Happiness" for the OVA series. No concrete information exists regarding his background story, family history, personal goals, or specific character development across official media.