She attends Tokiwadai Middle School, a famous girls' school for the rich and elite psychics and one of the five elite schools of Academy City. To most people, she is considered a proper lady, but in reality, she has a short-tempered, prideful, and improper attitude with some tomboyish tendencies and insecurities, a fact few other characters know. She is fond of cute, childish things, such as flowery pajamas and Gekota, the popular frog mascot franchise. She has a strong sense of morals and hates injustice, contrary to what she claims.

​Haruhi Suzumiya, a first year student at North High School (in novels 1-8), and second year (in the 9th and latest novel), can be characterized as funny, eccentric, and somewhat unpredictable. In the series, she is introduced declaring her interests in aliens, espers and time travelers and does not care for 'ordinary' human beings. The last thing on her mind is a normal high school life. With a burning desire to find such phenomena in the world, she is generally unapproachable and finds ordinary people boring and uninteresting. As a result of this, many of her classmates choose to avoid and confront her. She deals with her emotions by creating a parallel universe, where she inadvertently releases transparent creatures who tear up and destroy everything that comes into contact with them. Espers are the ones who can stop these creatures by cutting and destroying them, because if these creatures are left alone destroying everything as well as the outer barrier it could affect the outside world. She also likes to dress up Mikuru in random outfits.

​The second mysterious angel that descends from the sky who possesses transparent wings shining in seven different colors. She has a selfish personality, and at times, she has a tsundere nature.