Eikei

The leader and strongest of the Otokojuku Shitennou . His loyalty to Jaki is very high, and not even in unconsciousness will he step on Jaki's shadow. He is a master of the Kiritsu-ryuu poison fist technique and the Kijin-ryuu weapon style. He joins Jaki in the final battle of the Paren Seiha in the Tenrai Kyoushintou against Momo & Gekkou and defeats Gekkou

(Srouce : Wikipedia)