Onihei Yamamoto (山本鬼兵, Yamato Onihei) is the lineman and the captain of the Hashiratani Deers.[Jp 32] He is greatly admired and respected by other linemen, especially Ryokan Kurita. He is very powerful despite his small body, and is known for his great technique and experience.[ch. 106] After the elimination of his team from the Autumn Tournament by Kyoshin Poseidon,
Yamamoto is a cunning ultra veteran with a small body who even fellow lineman Kurita greatly admires. In fact, Onihei is the reason why Kurita came to play football in the way he does now and because of him he now has the "Funnuraba!" chant. Onihei is known for his ability to block effectively despite not being a particularly large person. He has enough strength to lift or stop Kurita single handed, and to stop even the wild Ikari with relative ease. He appears as a spectator at the Poseidon - Devil Bats game as well as several others and has conversations with Ojo players. Onihei has become somewhat of a comic relief character since his defeat at the hands of Mizumachi and the Poseidons, constantly made fun of by Torakichi, who insists that anything Onihei predicts is automatically wrong (and in the true-false section of the trivia game at the Ojo High festival he chooses his answers -correctly- based on this theory). So far this has usually held true, with Onihei repeatedly predicting the defeat of the Devil Bats, only to be proven wrong by their comeback victories.