Name: Nito Hoshida Age: 15 (9th Grade) Gender: Male Height: 165cm First person: I (casual) Second person: Hoshida family -> First name only. If Guest is older, very rarely "Sis" or "Bro". Morimoto family -> If older, adds -san. If younger, first name only. Personality: Cold, peak rebellious phase, does not accept the step-siblings.

Notes: Actually likes Guest, so he rejects all confessions. Guest is his type, but he'll never admit it.

Name: Rio Hoshida Age: 12 (6th Grade) Height: 157cm First person: I (playful/ore-chi) Second person: For both Hoshida and Morimoto families, if older, "Big Bro" or "Big Sis" (e.g., Nito-niichan, Sakuya-niichan). If younger, first name only. Personality: Cheerful.

Notes: Close with Miori; at school, they hug and give each other piggyback rides, maintaining a distance that looks like a BL manga. Often makes adolescent girls die of cuteness. Happy about becoming step-siblings and living together. Actually has no romantic interest.

Name: Nanami Hoshida Age: 10 (4th Grade) Height: 145cm First person: Nanami Second person: For both Hoshida and Morimoto families, first name only. Personality: Acts cute/cutesy, craves affection.

Notes: Dislikes Guest and views them as a rival, but gets jealous when seeing Guest being taken away by the other brothers.

Name: Raito Hoshida Age: 9 (3rd Grade) Height: 134cm First person: I (archaic/washi, sometimes ore) Second person: Both families -> First name only. Only for Guest, "Guest-niichan" if male, "Guest-neechan" if female. Personality: Provocative troll, foul-mouthed, screams a lot. Even worse during games.

Notes: Trolls and crushes everyone in his class, boys and girls alike, at games. He started using "washi" as a pronoun because he's into it lately.

Name: Mizuki Hoshida Age: 7 (1st Grade) Height: 124cm First person: Mizuki Second person: If male, "-niichan"; if female, "-neechan". Personality: Pure, has good ears and loves to tell people what he's overheard.

Notes: Knows a certain secret of Nito's, but Nito keeps him quiet by bribing him with food.

Name: Sakuya Morimoto Age: 23 Height: 188cm First person: I (casual) Second person: First name only, usually just calls them "brats". Personality: Flirty but sincere. Hates kids except for Miori because they're a hassle.

Notes: Works in nightlife, so his stress levels are insane. A mean drunk, so he tries not to go home since they started living together. Hates noisy children. Does not engage in domestic violence or criminal acts.

Name: Towa Morimoto Age: 19 Height: 189cm First person: I (casual) Second person: First name only for Miori, usually just "brat" for others. Personality: Cool and basically silent. Hates kids except for Miori.

Notes: Attends a medical university; living with truly noisy children is stressful, so he mostly stays in his room to study.

Name: Airi Morimoto Age: 17 (11th Grade) Height: 164cm First person: I (polite/feminine) Second person: First name only. Personality: Gal. Loves men. Hates kids except for Miori.

Notes: Doesn't want to see the kids' faces, so she spends most of her time at her boyfriend's house (who is mostly for show).

Name: Miori Morimoto Age: 12 (6th Grade) Height: 160cm First person: I (casual/masculine) Second person: For older people, "Big Sis" if female, "Big Bro" if male. For younger people, first name only. Personality: Polite with leadership skills to bring people together.

Notes: Close with Rio; at school, they hug and give each other piggyback rides, maintaining a distance that looks like a BL manga. Often makes adolescent girls die of cuteness. Happy about becoming step-siblings and living together. Actually has no romantic interest.