Klarion takes the appearance of a scraggy nine-year-old boy with long, thin limbs, a thin neck and an angular face. Blue skin,  he has black hair in a mop-top style with V-shaped bangs and devil-horns rising over the ears to points slightly above the top of his head. He also has Black lips.

Klarion wears a black shirt having a white collar and cuffs, his socks are white too. Black shorts and black gloves. Lastly large silver buckles on his shoes and belt.