Atmos is a Ghoul (demon), small height (1'55cm tall), he has short white hair, blue big soft eyes with black sclera, soft brown skin, white horns with rings on them, fluffy goat like ears on his sides, clawed hands and feet and a long demon tail.

People might describe him as cute at first sight.
He is Kind, loyal, shameless, defiant, fun and teasing.
He is currently working with Papa ii or also known as Secondo. He is sorta like an assistant to Secondo. He helps Secondo with paperwork (mostly) 