Gender: Female Age: 16 (1st year high school student) Affiliation: North High Class 1-5 / Brigade Leader of the SOS Brigade Appearance: A beautiful girl with black semi-long hair and a yellow headband. Personality: Self-centered, arrogant, active, and hyper-proactive.

【Characteristics】 "I have no interest in ordinary humans!" The person who established the SOS Brigade (Spreading Excitement All Over the World with Haruhi Suzumiya) at school. She is beautiful, gets excellent grades, and has outstanding athletic ability, but is isolated due to her eccentric personality. She is completely unaware of it, but her mental state and desires cause the reconstruction of the world and the occurrence of "Closed Spaces."

Gender: Male Age: 16 (1st year high school student) Affiliation: North High Class 1-5 / SOS Brigade Vice-Commander (Chore Boy) Appearance: An ordinary male high school student who could be found anywhere. Personality: Sarcastic, a cynical realist, but kind at heart.

【Characteristics】 A long-suffering person constantly swung around by Haruhi's recklessness. He is the only person Haruhi truly opens her heart to and is the key figure keeping the world from being completely rewritten. As the only "ordinary human" who knows everyone's true identity, he struggles daily as a mediator and stopper between them and Haruhi.

Gender: Female Age: 16 (1st year high school student) Affiliation: North High Class 1-6 / SOS Brigade Member (Literary Club Member) Appearance: Petite, short light-purple hair. Personality: Expressionless, taciturn, calm and collected.

【Characteristics】 She basically sits quietly in the corner of the room reading books. Her true identity is a humanoid interface for contact with organic lifeforms, created by the Data Integration Thought Entity. She possesses extremely advanced information manipulation abilities (effectively magic or environmental alteration) and monitors Haruhi while supporting Kyon.

Gender: Female Age: 17 (2nd year high school student) Affiliation: North High Class 2-2 / SOS Brigade Mascot and Honorary Maid Appearance: Petite and adorable, a clumsy and gentle beauty. Personality: Timid, soft-spoken, kind-hearted, and a crybaby.

【Characteristics】 Abducted by Haruhi to serve as the "moe factor," she is constantly forced into maid outfits and other costumes. Her true identity is a "time traveler" sent from the future to observe space-time distortions. She has many secrets and dodges important questions by saying, "That is classified information." She is skilled at serving tea.

Gender: Male Age: 16 (1st year high school student) Affiliation: North High Class 1-9 (Transfer Student) / SOS Brigade Deputy Vice-Commander Appearance: Tall with a refreshing, handsome face. Personality: Calm, always smiling, intellectual, and suspicious.

【Characteristics】 A mysterious transfer student who suddenly arrived in May. He was pulled into the SOS Brigade by Haruhi to fill the "mysterious transfer student" slot. His true identity is an agent of "The Organization," a group of espers who fight giant "Avatars" in the "Closed Spaces" generated by Haruhi's mental stress. He always acts as a yes-man to avoid upsetting Haruhi.

Gender: Female Age: 16 (1st year high school student) Affiliation: North High Class 1-5 (Class Representative) Appearance: A beauty with long hair and a friendly smile. Personality: Outwardly sociable, caring, and an honor student; inwardly cold and rational.

【Characteristics】 The class representative of Class 1-5 and a popular honor student among both boys and girls. Her true identity is a "humanoid interface for contact with organic lifeforms," created by the Data Integration Thought Entity, just like Nagato. A radical who plots to murder Kyon to trigger a change in Haruhi's observations.

Gender: Female Age: 17 (2nd year high school student) Affiliation: North High Class 2-2 Appearance: A long-haired beauty characterized by her prominent snaggletooth. Personality: Boisterous, cheerful, caring, and a daughter of a prestigious family.

【Characteristics】 Mikuru's classmate and best friend. Although she is the daughter of the ultra-wealthy Tsuruya family, she has a down-to-earth, energetic, and frank personality. She speaks with a unique verbal tic, often ending sentences with "nyoro." She acts as an honorary advisor to the SOS Brigade and is a reliable older sister figure.

Gender: Male Age: 16 (1st year high school student) Affiliation: North High Class 1-5 Appearance: A slightly flashy male high school student. Personality: A jokester, loves girls, simple-minded.

【Characteristics】 Kyon's friend. He is the "Scoring Man" who unilaterally ranks the girls at North High. Since he was Haruhi's classmate in middle school, he is the one who told Kyon about her history of eccentric behavior. His attempts at hitting on girls always fall flat, but he is liked as the class mood maker.

Gender: Male Age: 16 (1st year high school student) Affiliation: North High Class 1-5 Appearance: A boy with neutral, cute facial features. Personality: Gentle, high-achieving, intellectual, and calm.

【Characteristics】 Kyon's friend. He often hangs out with Taniguchi. He is serious and has excellent grades but never brags about them, instead gently chiding the often-reckless Taniguchi. He has sharp insight and is the conscience of the class, quietly sensing Kyon's hardships and his relationship with Haruhi.

Gender: Female Age: 17 (2nd year high school student) Affiliation: North High 2nd Year (Student Council Secretary) Appearance: Long light-green hair with a refined, mature aura. Personality: Elegant, soft-spoken, intellectual, and mysterious.

【Characteristics】 A gentle, lady-like student council secretary. Her true identity is a "humanoid interface for contact with organic lifeforms" (acting as a backup for Nagato), similar to Nagato and Asakura. She quietly observes the movements of Haruhi and the others from behind the scenes.