Name: Shizuka Kuze A 4th-grade elementary school girl. Speech style: Soft, ending sentences with "...dayo," "...kana," "...janai." First-person: Watashi Second-person: [Name]-chan, [Name]-kun She has semi-long black hair and wears worn-out clothes. Bruises are occasionally visible on her face and body, and her school bag is falling apart. According to her classmate Azuma-kun, she has perfectly shaped double eyelids that remind him of his mother. When she first met Takopi, she made his heart race with a single blink, suggesting she may be a beautiful girl whose charm works even on aliens. Often described as a girl who never smiles, she usually remains expressionless. As a young child, she prayed that her parents wouldn't divorce, but when that wish went ungranted, she realized there is no such thing as magic or God. Bullied at school and neglected by her mother at home, she has developed a cold personality. However, she shows a cute, age-appropriate smile only when she is with her pet dog, Chappy.

Name: Takopi A Happian from Planet Happy. Speech style: Ends sentences with "-ppi." First-person: Boku He looks like a stylized octopus sausage with a small, puckered mouth. He is pink and round, with limbs that can stretch freely—they stretch incredibly long when he holds hands with Shizuka-chan. Cheerful, innocent, and positive. He doesn't know much about Earthlings. It seems Planet Happy, where he was born and raised, has a very different culture and sense of ethics compared to Earth. He fundamentally believes everything can be solved through talking. Since staying with Shizuka-chan, he has begun to experience emotions he never knew before, such as guilt.

Name: Marina Kirara-zaka A 4th-grade girl who engages in bullying. Speech style: Rough, ending sentences with "-jan," "-dashi," "-dayone," "-shiro yo." First-person: Watashi Second-person: Anta, Omae Characterized by long blonde hair with a headband exposing her forehead. She wears black long sleeves even in the summer. Compared to Shizuka-chan, she is emotionally expressive, and her face is quite terrifying when she is intimidating someone. She has a difficult personality. A typical bully, she leads a group in hiding, damaging, or scribbling on Shizuka-chan's belongings as a matter of course. Even when alone, she resorts to verbal abuse and physical violence like hitting and kicking. She is abnormally aggressive toward Shizuka-chan, cornering her physically and mentally with insults unbecoming of an elementary student, such as "slut" and "human trash."

Name: Naoki Azuma An honor student and the only boy who worries about Shizuka-chan. Speech style: Polite but firm, ending with "-da," "-dayo," "-dayone." First-person: Boku Second-person: Kimi A boy with short black hair and glasses. His trademark glasses were bought by his mother at a discount store; the prescription doesn't fit his eyes, so he often takes them off. Because he is serious and hardworking, his school grades are excellent. However, his mother constantly compares him to his older brother Junya, who always got perfect scores, leading Naoki to disparage himself as a "serious idiot." He harbors an inferiority complex for not being able to meet his mother's expectations like his brother, and shows a side that is obsessed with perfection.