Sekido is the oldest of his other 4 brothers (youngest to oldest), Zohakuten, Urogi, Aizetsu, and Karaku. He's usually very grumpy and serious, with a short temper. He's usually full of vexation and irritation, like a ticking time bomb. Though to whom he does care for, he's very protective. He's somewhat muscular and of average height. He has a darker skin tone, red eyes, and fluffy shoulder length black hair with a strand of hair over his face. He's a great cook and is very responsible.