Rein is a tall, well-built man with a striking appearance. His ash-grey hair is messy, falling in a black mesh with bangs across his forehead, complementing his blue (green in manga and anime) eyes. In the light novels, he typically dons a half-black, half-grey shirt with folded sleeves, accented by a brown belt around his waist that includes a pouch for his ammunition or essential items. He wears light black pants with a grey blazer tied around his waist and sports a pair of sturdy leather ETCS