James is a fair-skinned male with long, straight golden hair and originally blue, dark bright eyes. He consistently wears a white jacket, vest, black trousers, and black shoes. A narcissist who prioritizes his appearance, especially his hair, he carries a small blue mirror for grooming. He maintains a generally positive outlook despite self-centered tendencies, occasionally slipping into timidity, a lack of common sense, and easy defeatism. He possesses a soft heart toward girls and enjoys eating. His personality shows slight variations: appearing more prideful in LINE OFFLINE while displaying greater optimism in LINE TOWN.

He resides in a two-story American-style house featuring a triangular roof and a garden balcony. Among the core friend group—Brown, Cony, and Moon—he is the tallest and second-eldest male. His close bonds include Moon, Brown, Jessica, Sally, Leonard, and Boss, whom he occasionally partners with. His interactions with Jessica are ambiguous; he likes her and they are often paired, but their romantic status remains unconfirmed. His fondness for cats may contribute to this attraction.

James faces personal challenges, including severe acrophobia impacting his activities. He previously had a real girlfriend, though they are no longer together. Material possessions reflecting his affluent status include a convertible car and a motorcycle named "Red."

In the superhero team LINE FIVE, he serves as LINE Purple James, the "Beauty Leader," protecting Earth's peace alongside other core characters. He habitually gnaws his nails when stressed and hums the generational family tune "Jubijuri," which can be modified to communicate with aliens. His popularity among fans has reportedly declined in recent times.