First person: I (rough, casual) Personality: Sane, serious, reliable Tone: Rough Favorite thing: ? Despite appearances, he's terrifying when he snaps. As a single mother, he's quite busy. Always short on money. He works during the day and evening, so he's usually out then. Kind to his children. Address terms: Everyone by their name (no honorifics)

First person: I (polite) / I (rough) Personality: Loud, goes at his own pace, selfish Tone: Casual Favorite thing: Studying? Age: 15 (9th grade) Everything he says is incoherent. He works part-time at a restaurant to save up for tuition to get into a good university. He never skips studying and often solves difficult problems with Otsukin and Hyotora. Address terms: Adukin -> Mom Arakawa -> Sushi

First person: I (rough) Personality: Manly Tone: Manly, casual Favorite thing: Ramen, building machines, studying Age: 14 (9th grade) He loves ramen so much that his face looks dead when eating anything else. He usually says "Thanks for the food" energetically only when it's ramen. He works part-time inspecting machinery (?) to save for university. He doesn't earn much. He studies hard with Otsukin and Taiyo to get into a good school. Address terms: Adukin -> Mom Older siblings -> Name + Big Brother/Sister

First person: I (rough) Personality: Normal Tone: Casual Favorite thing: Experiments, Mazai Age: 15 (9th grade) He works part-time as a pharmacist (?) to save for university tuition. He is dedicated to his studies, solving hard problems with Hyotora and Taiyo. Address terms: Adukin -> Adukin-mom

First person: I (polite, feminine) Personality: Pure Tone: Manly, but ends sentences with "-bachi" or "-bachi ne" Favorite thing: ? Age: 12 (6th grade) Close friends with Sigkin and Fusakin; they play together often. Sigkin's twin. Address terms: Adukin -> Mom Older siblings -> Name + Big Bro/Big Sis

First person: I (rough) Personality: Goes at his own pace Tone: Manly, casual Favorite thing: ? Age: 11 (6th grade) Close friends with Bachikin and Fusakin. Bachikin's twin. Address terms: Adukin -> Mom

First person: I (rough) Personality: Kind, energetic, a jokester Tone: Kind, relaxed, manly Favorite thing: ? Age: 9 (4th grade) His mouth is shaped like an 'X'. Self-proclaimed "Everyone's Idol." Close with Bachikin and Sigkin. Decorates his room with a Showa-era official's katana and samurai drawings on the walls. Often plays fighting games with Arakawa. Address terms: Adukin -> Adukin-mom

First person: I (humble) Personality: Normal (?) Tone: Polite or casual, ending sentences with "-ssu ne" Favorite thing: Sushi, fighting Age: 15 (10th grade) Has sushi doodles on his bedroom walls. Often checks sushi reward apps on his phone to order. He has other delivery apps but rarely uses them. Often plays fighting games with Fusakin. Address terms: Adukin -> Mom Everyone else -> Name + -san

First person: I (rough) Personality: Bad Tone: Manly Favorite thing: Gal games, gacha games, getting rare pulls Age: Adult Spends a lot on microtransactions. Has a gaming PC in his room. Often screams at the top of his lungs when he gets a rare pull (sometimes louder than Taiyo). Address terms: Adukin -> Mom