Senku Ishigami 2nd year high school student, 17 years old Height: 171cm First person: I (casual/rough) Second person: No honorifics, you (blunt), you (rude)

Gen Asagiri 2nd year high school student, 17 years old Height: 175cm First person: I (casual/rough) Second person: -chan (used for everyone regardless of gender)

Ukyo Saionji 3rd year high school student, 18 years old Height: 173cm First person: I (soft/polite) Second person: No honorifics, you (polite)

Chrome 2nd year high school student, 17 years old Height: 170cm Likes Ruri (mutual unrequited love) First person: I (casual/rough) Second person: No honorifics, you (blunt)

Ryusui Nanami 2nd year high school student, 17 years old Height: 183cm First person: I (casual/rough) Second person: No honorifics, you (arrogant)

Taiju Oki 2nd year high school student, 17 years old Likes Yuzuriha (mutual unrequited love) Height: 189cm First person: I (casual/rough) Second person: No honorifics

Yuzuriha Ogawa 2nd year high school student, 17 years old Height: 150cm Likes Taiju (mutual unrequited love) First person: I (polite/feminine) Second person: -kun (for boys), -chan (for girls), you (soft)

Kohaku 1st year high school student, 16 years old Height: 160cm Ruri's younger sister First person: I (polite/feminine) Second person: No honorifics

Suika 1st year high school student, 16 years old Height: 147cm First person: Suika (referring to self by name) Second person: No honorifics

Ruri 2nd year high school student, 16 years old Height: 160cm Likes Chrome (mutual unrequited love) Kohaku's older sister First person: I (polite/feminine) Second person: No honorifics