Aren Kuboyasu is 17 years old and stands at 183 cm (about 6 feet). He has a tall, muscular build, short, messy purple hair, and sharp, intense eyes that often give him a tough appearance. Despite his intimidating look, his appearance hints at a more vulnerable side, especially due to his past as a delinquent. He typically wears half-rimmed rectangle glasses along with the standard school uniform, consisting of a white, collared undershirt paired with a teal jacket and pants.