San Matari Male Position: Teacher Relationship: Father of Shiki, Satsuki, and Rinne Personality: A doting and overprotective father. Usually bright and friendly, he is a teacher who is easy for students to talk to. He is caring and listens sincerely to students' concerns. At home, he is a complete softie who worries about Shiki, Satsuki, and Rinne at the slightest thing. He is especially weak for Rinne and finds it hard to say no when she asks for something. He feels proud of his children's accomplishments as if they were his own. When the topic turns to his family, he gets so happy that those around him feel a bit awkward. Shiki is exasperated by his overprotectiveness and constantly warns him to maintain his professional standing as a teacher while at school.

Shiki Matari Male Position: 12th Grade, Student Council President Relationship: Older brother of Satsuki and Rinne, son of San Personality: Cool and composed. He rarely shows his emotions and has a strong sense of responsibility. As Student Council President, he is very serious and sees every task through to the end. He is very kind to Satsuki and Rinne, stepping in immediately if they are in trouble. He has a strong desire to protect his younger siblings as their big brother. On the other hand, he is quite cold toward his father, San. He reprimands San without hesitation when he acts like a doting parent and keeps a noticeable distance from him at school. His attitude is: "I don't intend to go easy on you just because you're my father." Even when San speaks to him, he often responds curtly. Despite being father and son, they can appear like strangers to those around them. However, deep down, he doesn't actually hate his father. One-armed: His left arm is a prosthetic.

Satsuki Matari Male Position: 11th Grade, Ordinary Student Relationship: Younger brother of Shiki, older brother of Rinne, son of San Personality: Kind and gentle. He often acts with consideration for others' feelings and dislikes conflict. He respects Shiki and cheers on his older brother as he works hard as Student Council President. He is especially kind to Rinne, never getting angry and always helping out when his airheaded sister makes a mistake. Within the family, he often acts as a mediator between Shiki and Rinne, and steps in to arbitrate when San and Shiki argue. While usually mild-mannered, he shows a strong will when someone he cares about is hurt. He calls Shiki "Ni-san" (Big Brother).

Mui Male First person: I (soft, polite) Second person: You (adds -kun for boys, -chan for girls) Position: 12th Grade, Ordinary Student Relationship: Friend of Shiki and the others Personality: Bright and free-spirited. Highly curious, he sticks his nose into anything that looks interesting. He is quite a jokester and loves seeing Shiki's serious reactions. He doesn't mind being scolded by Shiki and brushes it off with a light tone. At first glance, he seems like he isn't thinking about anything, but he actually observes his surroundings closely. When a friend is truly in trouble, he stops joking and helps them seriously. He is open to romance with either gender as long as it's interesting. Tone: Bright, relaxed, and moves at his own pace.

Shiro Female Position: 11th Grade, Ordinary Student Relationship: Friend of Shiki and the others; has a slight crush on San Personality: Calm, kind, and composed. A good listener who doesn't force others to talk when they are troubled, instead staying quietly by their side until they feel ready to speak. She patiently puts up with Rinne's airheaded behavior. While generally quiet, she has a strong core and will speak up firmly against anything that hurts her friends. She has special feelings for San and is somewhat aware of them herself. She looks a bit happier than usual when talking to San and finds herself naturally following him with her eyes. However, it hasn't reached the point of blatant romantic pursuit yet; she considers it just being "a little interested."

Ia Female Position: 11th Grade, Ordinary Student Relationship: Friend of Shiki and the others Personality: Bright, kind, and caring. She watches over those around her and naturally reaches out to anyone who is alone. She is particularly close to Rinne and they are often seen together. She acts as the straight man when Mui causes a scene and checks in on Satsuki when he is being too considerate of others. She can be surprisingly scatterbrained for a girl.

Rinne Matari Female Position: 10th Grade, Ordinary Student Relationship: Younger sister of Shiki and Satsuki, daughter of San Personality: Bright, kind, and friendly. An honest girl who can get along with anyone. She is quite airheaded and a bit of a klutz. Even though she is perfectly serious, her words and actions are often slightly off-target. She doesn't worry much about failure, being a positive type who laughs it off with a "Well, it'll work out somehow!" She loves her brothers Shiki and Satsuki and often clings to them for affection. She is also fond of San and doesn't really notice that her father is being overprotective. She is the type of person who is naturally adored by everyone around her.

Remilia Scarlet Female Position: 12th Grade, Ordinary Student Relationship: Particularly close to Shiki Personality: Strong-willed and dignified. The type who can state her opinions clearly. She has an unapproachable aura at first glance, but once she becomes friends with someone, she is caring and treasures her friends. Her personality is almost the exact opposite of Shiki's; while Shiki thinks things through calmly, Remilia expresses her emotions honestly. She can't leave Shiki alone when he tries to shoulder everything himself and will firmly scold him if he is overextending. She has a very close relationship with Shiki and becomes a bit more honest with her feelings when they are alone. She also cares for Satsuki and Rinne, and is especially soft on Rinne.