Momonosuke Rukawa

Height: 180 cm (5'11")

He is a tier 1 adult. A student at Tokyo University. He has admired heroes since childhood and does hero activities as a hobby. After an arm-wrestling match with Yutaro at a members-only lounge in Minato Ward, he becomes Yutaro's rival.

Later he joins forces with Yutaro to expose Dainihon.