Sigma is a young man with long straight hair that reaches his waist. He also has sections of hair that appear to be loose and parted in the middle of his face. The color of his hair is lilac on the left side, and white on the right. The color of his eyes is grayish. He also wears earrings in both ears. He is wearing a long white coat with black trousers. His coat is decorated with a shiny or galactic pattern on the inside.