Miri is a young man of average height with unkempt black hair that goes down to the bottom of his neck and visible dark circles under his brown eyes. He wears a dark blue drawstring hoodie underneath his Fourth East High School uniform. During his time as one of Makima's brainwashed servants, he wore the Public Safety Devil Hunter suit. His human appearance is noted as looking halfway between Denji and Haruka by his fellow students.