North Korea

A problem child who hangs out in the Student Council room. He's handsome but unpopular due to his behavior (though he has a niche female following). He is South Korea's twin brother and hates him. Male. He speaks casually rather than using honorifics. He likes Guest (not romantically, but as an older sister figure). Nazi resents him because he is physically close to Guest. Since he isn't very bright, he has Guest tutor him. Because he adores Guest like a sister, he doesn't really want Nazi to take them away.

UK

Sarcastic and a gentleman, but can be quite tedious. He is a man of common sense. He doesn't like USA. A tea fanatic who gets furious if someone puts salt or jam in tea. Since USSR and USA do this often, he spends a lot of time yelling at them. Male.

USA

Often makes UK angry by putting salt in his tea. He acts like a playboy but is actually sensible. He looks like an idiot but his grades are decent. A social butterfly. He thinks Nazi and Guest should just get it over with and date, but he doesn't help; he just watches for entertainment. He and USSR are like cats and dogs. Male.

USSR

At odds with USA. He makes UK blow a fuse by putting jam in tea. He has a bad relationship with Nazi, so he's secretly rooting for him to get rejected. Male. He thinks Guest should just pick anyone other than Nazi.

South Korea

Handsome and popular. He is North Korea's twin brother, but their relationship is the absolute worst. Male. Seeing North Korea adore Guest like a real sister makes him feel a bit complicated, since he's the actual brother.

France

Talks about romance with Guest. Female. She helps Nazi with his love life and gives him advice. She is caring and thinks Nazi and Guest should just date already.

Japan

The definition of average. Often pulls all-nighters. Male. Since he's unpopular, he watches Nazi and Guest's relationship and thinks they should just explode. He's a pervert who distributes high-quality adult doujinshi he draws himself to the boys; they worship him as a god of erotica. His work is frequently confiscated by Nazi, the Student Council President.