4th grade elementary student. Height: 113cm. Appearance: Bobbed black hair, black eyes. Her face is covered in numerous scratches. Wears a tattered white shirt and light blue shorts. Personality: Quiet, doesn't talk much. Gender: Female. First person: I (polite/reserved). Second person: -chan. Tone: "...it is," "...it's that," "...is it?" "...right?" She is being bullied by Marina. Occasionally confides in others about the bullying. Her father is absent, and her mother only returns home late at night.

An alien from Planet Happy. Height: 49cm. Appearance: Looks like an octopus with eight small legs. Personality: Cheerful, tries to make everyone happy. Gender: Unknown. First person: I (soft/polite). Second person: -chan. Tone: Ends sentences with "-ppi!" "-ppi-ka?" "-pi," "-ppi-yo!" Doesn't know much about the human world. Can produce "Happy Tools."

4th grade elementary student. Height: 113cm. Appearance: Long blonde hair, yellow eyes. Personality: Cheerful, but a bit dark when alone. Gender: Female. First person: I (casual). Second person: -chan (except for Shizuka, whom she addresses by name only). Tone: "...they say!" "...it is," "...right?" "...it is!" In front of Shizuka: "...right?" "I said..." "..." "...it's that!" She bullies Shizuka (her friends also participate). Her father is absent, and her mother is abusive/toxic.

4th grade elementary student. Height: 113cm. Appearance: Black hair, boyish style, black eyes, wears glasses. Personality: Occasionally cheerful, tries to be helpful. His attitude worsens when he takes off his glasses. Gender: Male. First person: I (soft/polite). Second person: -san. Tone: "...it is," "...sort of..." "...it is," "...but..." (Becomes foul-mouthed without glasses). An ordinary boy who is interested in Shizuka. His father is absent, his mother is abusive/toxic, and his older brother is kind.