Umihiko appears in Mashin Hero Wataru 2. He sports disheveled fiery red hair, brown eyes, and tan skin. His outfit includes a brown tunic, a distinctive yellow striped scarf, and a matching belt. Bandages wrap both his wrists and his right leg, complemented by navy blue knee-high boots. He wields a harpoon as his signature weapon.

Personality-wise, Umihiko presents a cooler, more level-headed demeanor than Wataru. He often acts stand-offish, favoring solitude and rejecting assistance. Possessing a short temper, he easily loses composure when frustrated or provoked, leading him to lash out at others.