Nat is a young boy of average height with red hair kept in a bowl cut and brown eyes. He has a tall nose line (which he took pride of) and has his number "30294" on his neck. He wears standard orphanage uniform.
Nat appeared to be a rather jovial and fun-loving kid. Being an extrovert, he is often seen mingling with the rest of the orphans. He is prideful of his nose line and took John's insult of it as a compliment. Nat seems to be easily intimidated, this was shown whenever he sees malicious-looking people or creatures such as Sonju.