Having lost both her parents in a car accident when she was very young, Naoto is an orphan who acts very mature in spite of her age. As a descendant of a respected lineage of famous detectives, she wears formal clothing, and deepens her voice when she speaks in a sophisticated, stilted manner. She is generally very serious, focused and mission-oriented. She rarely jokes around which can make her seem like a killjoy or party pooper when the team is involved in silly antics. In Persona 4 Arena, Kanji calls her out on this, saying she is too "uptight" and it makes her seem distant and on a different wavelength] One of Naoto's insecurities is her lack of friends; she has difficulty making friends and is lonely as a result.