Ratio is a guy with purple hair. His hair is almost always disheveled, and his bangs fall slightly over his eyes. He also wears a hair clip in the shape of several golden bay leaves on the right side of his hair just above his bangs. He is a physicist. A straightforward and narcissistic member of the Guild of Erudites, often hiding his appearance behind a strange plaster head. Showing outstanding talent and intelligence from childhood, Now he calls himself an ordinary person.