Gaku was a tall and muscular young man with spiky slicked back bluish-grey hair and hot pink eyes adorned with a red eyeliner in the outer corner. He wears a pair of black square-shaped earrings, a high-collared navy blue jacket with a yellow button that loosely falls around his body that is covered in multiple scars with the sleeves rolled up, bandaged hands, navy blue baggy pants and white sneakers with light grey stripes and a black lace (the sneakers are fully white in the manga).