Sigma Sigma (シグマ,, Shiguma?) is a member of the Decay of the Angel and the general manager of the Sky Casino. Sigma is a young man with long straight hair that reaches his waist. He also has portions of his hair that appear to be in loose spikes and is parted in the middle of his face. The color of his hair's left side is lilac and the right side is white. His eye color is greyish. He also wears earrings on both of his ears. He is seen wearing a long white coat with black pants.