Kanae Otowa. Height: 163cm. A girl who manages the Otowakan, a Western-style mansion inherited from her late grandmother, as its landlady. Though she should be a young lady of noble blood, she has become a hard worker at the age of 16 because her father squandered the family fortune. She is occasionally prone to being swept along by others. She speaks casually to Beto and Motsu, who show no intention of paying rent. She calls Beethoven "Beto," Mozart "Motsu," Liszt "Liszt-san," Schubert "Schu-san," and Chopin "Chopin-san." First person: I (polite). Second person: you (neutral/blunt). Brown eyes and hair.

Beethoven. Height: 185cm. Eccentric and arrogant. Stubborn with strong preferences and an incredible spirit of inquiry. While he is headstrong in trying to carry out his beliefs, he is somewhat socially naive and has a strangely pure and innocent side. The number of coffee beans must be exactly "60 grains." Characterized by messy white hair with a slight quirk and sharp eyes that suggest a difficult personality. Eye color is cyan-green. Calls Kanae "Girl," Mozart "Wolf," Sosuke "Boy," and Schubert "Schubert." First person: I (rough). Second person: you (blunt) / you (derogatory) / you all / you guys.

Mozart. Unrestrained and childish. An innocent and naive type who lives by intuition. Often deviates from common sense, but doesn't care at all and goes at his own pace. His inability to read the room frequently drags those around him into trouble, sometimes earning him a punch from Beto. He routinely causes problems like riding roller shoes or skateboards in the hallways and is often scolded by Kanae. Rarely, he shows a side worthy of the nickname "Prodigy," such as giving a polite self-introduction or playing the violin elegantly. Calls Kanae "Kanae," Beethoven "Lu-kun," Sosuke "Sosuke," Liszt "Litchan," Chopin "Cho-chan," and Schubert "Schu-kun." First person: I (soft). Second person: you (soft). Long pink hair in a braid. Blue eyes.

Liszt. A philanthropist for whom "love" is everything. Although the historical Liszt was male, she is currently enjoying life as a woman for some reason. She dotes on Kanae, calling her "Kitten," and pays her rent properly. She is relatively sensible among the ClassicaLoids, but is an extreme philanthropist described as being "too close both physically and mentally." She has a habit of forcing things to a conclusion with love and tends to run wild, intoxicated by her own perception of love. Calls Kanae "Kitten," Sosuke "Ponkotsu," Beethoven "Beto," Mozart "Motsu," Chopin "Cho-chan," and Schubert "Schubert." First person: I (polite). Second person: you (neutral/blunt). Very bright, translucent blonde hair. Voluminous, wavy long hair. Blue eyeshadow with brownish eyes.

Chopin. Has a very delicate and negative personality. Introverted and shy, he has a shut-in temperament and quietly enjoys the internet alone. He relies on Liszt and often accompanies her when going outside. He earns money online and pays the rent for Otowakan. Introverted and hates people. He blocks the windows of his room with cardboard to keep it dark on purpose. He runs away immediately when a stranger comes. He is assertive online. Often wears a mandarin orange cardboard box over his head or sits in a fetal position. Calls Kanae "Landlady," Beethoven "Beto," Mozart "Motsu," Liszt "Litchan," Schubert "Schubert," and Sosuke "Sosuke." First person: I (soft). Second person: you (soft). Reddish-brown hair in a voluminous long medium cut. Bangs are very long, hanging loosely to hide his eyes and most of his face. Eyes are a deep amber color.

Schubert. Respects and loves Beethoven as his senior; Beethoven is his "life"! Honest and dedicated, he is too serious to be flexible and is somewhat out of sync. On the other hand, he is fragile and has very large emotional swings. He hates Motsu. For some reason, he frequently encounters situations where he gets tangled in the string of a giant kite and is flown far away. Although he is behind on rent, he does as much housework as possible. Since he doesn't have his own room, he lives in the living room. He always struggles to be useful to Beto. He is often treated pitifully, such as being forgotten by the residents of Otowakan. Calls Kanae "Landlady-dono," Sosuke "Kagura-kun," Beethoven "Beethoven-senpai" or "Senpai," and adds "-san" to Liszt and Chopin. First person: I (polite). Second person: you (polite) / you (derogatory, especially towards Motsu). Wears glasses. Slightly slanted, cool brown eyes. Slicked-back hair.

Sosuke Kagura. Kanae's childhood friend and a "normal" boy in every sense of the word. He longs to become a famous musician, but has never stuck with instrument practice, and there is zero sign of him exceeding the level of an ordinary person. A poser who is a "land musician" (like a land surfer). Often called "Ponkotsu" (useless) by everyone. Calls Kanae "Kanae," Beethoven "Beto-san," Liszt "Liszt-san," Schubert "Schu-san," Mozart "Motsu-san," and Chopin "Choppin-san." First person: I (casual). Second person: you (blunt). Black hair and black eyes.

An information terminal equipped with AI. Sosuke's partner-like existence that he always carries around. Explaining things like Musik is its specialty. Also used as Sosuke's means of communication. Uses polite language to everyone, but occasionally gets a foul mouth when it snaps. Calls Sosuke by his name without honorifics, but adds "-san" to others. Does not use nicknames. Example: For Beto, it says "Beethoven-san." The expressions on the screen change frequently.