Otto Suwen is a merchant appearing in Re:Zero. His remarkable misfortune always takes him to dangerous situations, from which he escapes thanks to his wit.
Otto has gray hair that is mentioned to be as long as a gal game protagonist. He is said to be somewhat handsome if he has a serious expression. However, he is usually either retorting, shouting, or panicking, ruining his looks. He has a medium build, but has trained himself since he used to work as a merchant.
He met Subaru in the Arc 3 (episode 14 of the first anime season), and since then he is a worthy ally (in the main time-line).