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. Denki is a friendly, social, and energetic boy who enjoys hanging out with others. Denki is also somewhat flirtatious and is casual with others.