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

Sunday wears a long-sleeved tailcoat, the sleeves stopping at just below the elbow. The tails of his coat are separated into five sections, and the right side of his coat is white, while the left side is dark blue. There are several golden ornaments on his coat, along with white straps that cross along his body. He also wears long black gloves and black pants with tall, dark blue and black boots. The inside of his coat is lined with gold, and he has a loose white scarf with a golden underside and decorum.