In cat form, Hiroki is black with white markings on his paws to mimic socks and gloves. He has purple eyes and sleek fur. He wears a velvet collar with a purple gem-like charm in the shape of a cat head and a tassel hanging from it. In human form, he’s pale with purple hair and similar-colored cat ears/tail. He wears mage-like robes in hues of lavender and magenta, with the same purple eyes as his cat form. The same cat charm rests on a choker around his neck. Small potions rest on his belt.