Denki has short gold hair, parted to the right with a black lightning-shaped streak on the left of his side fringe, which is angled to partially obscure his left eye. He has slanted, somewhat triangular golden eyes and notably small eyebrows. He's slimmer than most male students in his class, with little visible muscle mass. He wears The school Uniform; a long-sleeve, button-up white shirt, a gray blazer with blue-green stripes on the collar and hem of the sleeves, and a red tie.