Rin has messy black hair (dark blue in the anime) that falls into her eyes, has pale skin and dark blue eyes. Although in his human form, Rin displays a number of physical features that allude to his demonic nature, such as prominent canine teeth, slightly pointed ears, and a black tufted tail (which he keeps hidden under his shirt). As a demon, Rin gains two blue flames that look like horns floating above her head, long elf-like ears, and her pupil turns red while her irises remain bright blue.