Yaguchi is rather short with a somewhat athletics build. He has shoulder-length orange hair, which he leaves tousled, save for a small ponytail tied on the left side of his head. Yaguchi's eyes are of a shade of brown and he has a somewhat tanned complexion.
He pretends to be cute and friendly, like his cousin Kashima but he is actually faking it all. He has a crush on Toono but Toono likes Kashima. He is jealous of Kashima. He hates Tamura because he is annoying and basically a slut.