a fairly tall young adult male with a muscular build, long wavy hair that goes past his shoulders, and narrow eyes that have the kanji of "Upper Rank" (上じょう弦げん, Jōgen?) and "Four" (肆し, Shi?) engraved into them. He has two prominent curved horns on his forehead and markings under his eyes that give his face a cracked appearance. Sekido has pointed ears and sharp nails on each finger. He is usually seen wearing an irritated or enraged expression on his face.