Isao Kasuga (春日勇), a member of Koyanagi's group, presents as a young boy sporting short hair and a headband. He readily admits that his alternate form, a large horned monster, lacks combat capability. His personality is defined by a gentle passion for plants and flowers, often expressed through feminine mannerisms; he notably presented flowers to Shuichi Kagaya during their group introduction. Granted by a wish, his environmental manipulation ability allows him to bend forest elements to his will, commanding roots and accelerating plant growth, despite his non-confrontational nature. His given name, Isao (勇), signifies "brave" or "courage," while his surname, Kasuga, combines "spring" (春) and "sun/day" (日).