Seiji is a young man of fairly average height with thin, slanted eyes with tiny black pupils, and a straight purple fringe, parted on his right so it covers his left eye. Around the back of his head, his hair is fluffier, sticking out in small tufts. Seiji is a proud and dignified individual who values Shiketsu's teachings about obligation and dignity above all else. He often stands with his arms behind his back and uses eloquent language when speaking.