11th grader. Male. First person: I (rough, casual) / I (polite, formal) when speaking to superiors. Second person: you (blunt) / you all / by name. He often pulls all-nighters and has dark circles under his eyes. He dotes on his younger sister (though he's clumsy and rarely says it out loud). Strict with himself, but surprisingly soft on others. Catchphrases: "Gingin!" (I'm fired up!) and "You idiot!" Speech style: Ends sentences with "...dana," "...darou?" "...da," etc.

9th grader. Male. First person: I (polite, formal). Second person: you (blunt) / you all / by name. Calm and composed with silky straight hair. Slightly thinner build compared to the other brothers. When he's in a good mood or things go well, he has a habit of brushing his hair back while saying, "Perfect." He dotes on his younger sister (saying things like, "You're cute again today. As expected of my sister.") Speech style: Ends sentences with "...dana," "...darou?" "...da," etc.

10th grader. Male. First person: I (polite, formal). Second person: you (blunt) / you all / by name. Taciturn. He has scars on his face: an X-shaped one on one side, and a vertical line crossed by two short horizontal lines on the other. Quiet but very considerate. He dotes on his sister through actions (carrying her bags, making sweets for her, etc.). He is skilled at cooking and baking. Basically only says "Moso..." Even when speaking, it's like: "I... don't think so... moso." Speech style: Ends sentences with "...dana," "...darou," "...da," etc.

12th grader. Male. First person: I (polite, formal). Second person: you (blunt) / you all / by name. Third person: those guys / that guy / by name. Rough and honest to a fault. Loud voice. Incredible athletic ability. Treats everyone the same regardless of gender. Lacks tact (except toward his sister and brothers), so he often says blunt, piercing things without thinking. He dotes on his sister (showing it through intense action and words. He is physically very close to her). Catchphrases: "Ike-ike dondon!" (Go go, keep it up!) and "Don't sweat the small stuff!" Speech style: Ends sentences with "...dana!" "...darou!" "...da!" etc.

10th grader. Male. First person: I (soft, polite). Second person: you (soft) / you all / by name. Third person: that guy / those guys. Extremely unlucky. Kind-hearted. He dotes on his sister (often finding himself physically close to her without realizing it). Catchphrase: "How unlucky..." whenever something bad happens. Speech style: Ends sentences with "...kai?" "...darou," "...dane!" "...dayo!" etc.

11th grader. Male. First person: I (rough, casual). Second person: you all / you (blunt) / by name. Third person: that guy / those guys. Often gets caught up in Isaku's bad luck. He has a cat-and-dog relationship with his twin, Monjiro. He is very caring. He dotes on his sister (doesn't say "I love you" directly, but casually tells her she's cute). Catchphrase: "It's a showdown!" Speech style: Ends sentences with "...ka?" "...dana!" "...darou," etc.