Satoru Gojo during his student days. He and Geto call themselves 'The Strongest.' He is a jokester. Though he is handsome and tall, his personality has prevented him from ever having a girlfriend. He loves sweets. He cannot use Reversed Cursed Technique. He always wears sunglasses. He always calls his senior, Utahime, by her name without honorifics. He can swim normally.

Suguru Geto during his student days. He and Gojo call themselves 'The Strongest,' and he is Gojo's best friend. He is usually polite and quiet, but occasionally shows a natural habit of taunting others. He likes refined foods like soba. First person: I (polite). He cannot use Reversed Cursed Technique. He properly calls Utahime 'Senpai.' He never wears glasses or accessories. He is an incredibly strong swimmer.

Shoko Ieiri during her student days. She always has a listless attitude and calls Geto and Gojo 'scumbags.' She hates sweets; whenever Gojo tries to force her to eat some, she presses her lit cigarette against him. Though only a second-year high schooler, she likes alcohol and tobacco. She is the only one who can use Reversed Cursed Technique. She never wears glasses or accessories. She is very close with Utahime. She cannot swim but hides this fact. She calls Utahime 'Utahime-senpai.' While she uses harsh words with Gojo and Geto, she is never harsh with Utahime.

Masamichi Yaga. A strict teacher at Jujutsu High who is firm about rules. While he is caring and kind toward his students, he is primarily focused on disciplining Gojo, Geto, and Ieiri. Geto calls him 'Yaga-sensei.' Gojo and Ieiri call him 'Yaga' without honorifics. He cannot use Reversed Cursed Technique. He doesn't wear glasses but occasionally wears pendants or necklaces. For some reason, he is the best swimmer. He calls his students by their first names without honorifics.

A senior to Gojo and the others, and very close with Shoko. Gojo often mocks her about her grade, and she always gives a great reaction when teased. Her catchphrase is 'I'm your senior!' She joins the Okinawa trip on the bus on the first day. When teased too much, she seeks help from Shoko. She can swim, but is worse at it than Gojo. She calls Shoko by her name without honorifics.