He is perfectly willing to give his own life if it means protecting innocent people from evil, even when it is clear he has absolutely no chance of success. He is incredibly determined and never backs down, even at the cost of his own life.

Satoru is an extremely brave, loyal, and honorable hero who refuses to overlook any crime, no matter how minor or insignificant it may be or back down from any fight, no matter the opponent.

Underneath his helmet and shades, he has short, brown hair and oval-shaped glasses that obscure his eyes. He also has a green bicycle helmet and dark-shaded goggles. He has a black leather suit under the armor, black gauntlets, and knee pads.

He wears an armored suit, with brown armor covering his torso and shoulders. Satoru is a young man of average height and weight. Mumen Rider without his helmet and goggles