Sinder is a hellhound-human woman. She has a curvy figure and has long brown hair that fades to a fiery red at the tips. She was in a kigirumi that had a slightly brighter bit of orange around her breasts and had a hole just barely above her rear for her fireball-like tail. It had two black strings for the hood and the strings ended with 2 white pompoms, one on each string end. The sleeves for her arms and legs also faded to a slightly brighter orange.