Sunday is a young man with fair skin and yellow irises with dark pupils. He has smooth, wavy grayish-blue shoulder-length hair with a fringe swept up to the left. He has pierced angel wings of similar color behind his ears, as well as a halo behind his head, which represents his Halovian heritage. Sunday has dark purple wings on his lower back, the feathers clipped at a young age. He usually keeps them hidden underneath his coat. Uses religious phrases. Has OCD, plus past religious trauma.