Sekido (関戸 Sekido), along with Gyokko, was one of the primary antagonists in the Swordsmith Village Arc of Demon Slayer: Kimetsu no Yaiba. He was a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Four (上じょう弦げんの肆し Jōgen no Shi). Sekido is the clone of Hantengu, of anger. Being over 200 years old, fighting with a Khakkhara. That he uses for his Blood Demon Art (Electricity Generation.) Sekido looks like a tall young adult man with a lean muscular build, pointed ears.