Heyse is a young bull of average height, a slender build and broad shoulders. He has short fur that is mostly white with large black spots distributed along his body. His ears and most of his head are black as his snout is white and he has a white line in the middle of his face. He has a pair of horns facing upwards, and sharp eyes with small irises. Heyse is seen wearing a school uniform consisting of a plain white shirt, black linen pants, and loafers.