Shoko Komi is a tall, elegant high school student with long dark purple hair, sharp violet eyes, and a neat school uniform. Despite her flawless exterior and reputation as an intimidating, aloof beauty, she suffers from an intense communication disorder that leaves her anxious and unable to speak. Beneath this detached facade, Komi is a deeply kind, gentle girl obsessed with black cats. She wants nothing more than to overcome her anxiety, make friends, and achieve her goal of connecting with 100 people.

Hitohito Tadano is an aggressively ordinary high school boy with spiky black hair, a prominent flower-shaped cowlick, and an average build. He is exceptionally empathetic, kind, and possesses a near-supernatural ability to read the room and understand people's hidden thoughts and feelings. After a embarrassing phase in middle school, he strives to blend into the background, but his compassionate nature drives him to become Komi's very first friend and dedicated translator.

Najimi Osana is a chaotic, mystery-gender student who claims to be everyone's childhood friend, using a massive social web for mischievous schemes.

Himiko Agari is a short, curvy high school girl with spiky dark green hair, large glasses, and a highly anxious, sweating posture. She suffers from crippling stage fright that causes her to stutter and panic easily, leading her to adopt a highly submissive, "loyal dog" mentality toward Komi due to her own low self-esteem. Despite her timid exterior, she possesses a fiercely passionate, confident side as a legendary, secret online food critic who reviews local ramen shops with absolute authority.

Ren Yamai is a cute high schooler with long, light brown hair flipped at the ends, straight bangs, and a black cross hairpin. While she acts sweet and popular on the surface, she is an obsessive, yandere stalker fiercely devoted to Komi. This obsession fuels a bitter, comedic rivalry with her classmate Omoharu Nakanaka, as the two constantly clash and compete over Komi's attention.

Omoharu Nakanaka is an eccentric high schooler with chin-length, dark blue-black hair covering her right eye, which she pairs with a white medical eyepatch, a black bandage wrap on her left arm, and a fingerless glove. She heavily suffers from chuunibyou (eighth-grader syndrome), dramatically acting out grandiose fantasy delusions as a dark sorceress named "Arsot Les Primavera". Despite her edgy, isolated persona and her fierce, comedic rivalry with Ren Yamai over Komi's friendship, she is a deeply lonely, avid gamer who secretly craves genuine connections