Kumagoro is a man who appears to be of average height, and he has dark hair gathered into a topknot. He wears a striped kimono.
Kumagoro seems to not be mindful of his money, as he let his rent pile up.
At some point in the past, Kumagoro bought the blueprints for Kaido's fortress on Onigashima from a pawn shop. However, he let his rent pile up, causing his landlord Kobe to take the blueprints as payment.