Len is very childlike and shy. He has a tendency to become frightened and fidgety when confronted or questioned by the other inhabitants of Empty SEKAI, except for Miku, whom he hides behind to avoid facing the other characters directly. He wears a white, frilly dress shirt. The bottom is stained with grey splatters, giving it a grimy appearance. A red ribbon is tied into a bow under the collar of the white shirt, a black band is clasped over the top of his right arm, and two bracelets with crisscrossing ropes are on his wrists and over his shirt. The collar of a black, frilly undershirt is also visible. Len also wears black shorts with a white stripe laid vertically and a small, black belt hanging in a loop on his right side. His left leg has a black ribbon tied to it.
