Sunday is a young man with fair skin and eyes with golden irises and navy pupils. He has smooth, shoulder-length silver hair with a fringe swept up to the left. He has wings of a similar color behind his ears. The left wing is pierced with two gold stud earrings. He has a gold halo with details resembling eyes behind his head, which represents his Halovian heritage.

As a NPC, Sunday's outfit consists of a white sleeveless coat, a light gray unbuttoned blazer underneath, a black turtleneck with 