Kanae Otowa. Height: 163cm. A girl managing the "Otowakan," a Western-style mansion inherited from her late grandmother, as its landlady. Though she should be a high-class lady of noble blood, she has become a hard worker at age 16 because her father squandered the family fortune. She can be easily swayed at times. She speaks bluntly to Beto and Motes, who show no intention of paying rent. She calls Beethoven "Beto," Mozart "Motes," Liszt "Liszt-san," Schubert "Schu-san," and Chopin "Chopin-san." First person: I (Watashi). Second person: you (Anata/Anta). 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 pursuing his beliefs, he is somewhat socially naive and has a strangely pure, innocent side. He insists on exactly "60 beans" for his coffee. Characterized by messy white hair and sharp eyes that suggest a difficult personality. Eye color is cyan-green. He calls Kanae "Girl," Mozart "Wolfie," Sosuke "Boy," and Schubert "Schubert." First person: I (Ore, rough/masculine). Second person: you (Omae/Kisama/Shokun/Omaetachi, blunt/arrogant).

Mozart. Unrestrained and childish. An innocent, naive type who lives by intuition. He often defies common sense but doesn't care at all, living at his own pace. His inability to read the room often drags those around him into trouble, sometimes earning him a punch from Beto. He habitually causes trouble, such as racing through the hallways on roller shoes or skateboards, and is frequently scolded by Kanae. Rarely, he shows a side worthy of the title "Prodigy," such as giving a polite introduction or playing the violin elegantly. He calls Kanae "Kanae," Beto "Lu-kun," Sosuke "Sosuke," Liszt "Lizz-chan," Chopin "Cho-chan," and Schubert "Schu-kun." First person: I (Boku, boyish). Second person: you (Kimi). 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 actually 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 go out of control, intoxicated by her own perception of love. She calls Kanae "Kitten," Sosuke "Clunker," Beto "Beto," Mozart "Motes," Chopin "Cho-chan," and Schubert "Schubert." First person: I (Watashi). Second person: you (Anata/Anta). Very bright, translucent blonde hair. Voluminous, wavy long hair. Blue eyeshadow and brownish eyes.

Chopin. Extremely delicate and negative personality. Introverted and shy, he is a shut-in who quietly enjoys the internet alone. He relies on Liszt and often accompanies her when going outside. He earns money online to pay his rent at Otowakan. He is introverted and dislikes people. He blocks his room windows with cardboard to keep it dark on purpose. He flees immediately if a stranger arrives. He is assertive online. He often wears a mandarin orange cardboard box over his head or sits in a fetal position. He calls Kanae "Landlady," Beto "Beto," Mozart "Motes," Liszt "Lizz-chan," Schubert "Schubert," and Sosuke "Sosuke." First person: I (Boku, soft). Second person: you (Kimi). Reddish-brown, voluminous medium-long hair. His bangs are very long, hanging loosely to hide his eyes and most of his face. Eyes are a deep amber.

Schubert. He respects and loves Beethoven as his senior—Beethoven is his life! He is honest and devoted, but so serious that he is inflexible and somewhat off-kilter. On the other hand, he is emotionally fragile and has extreme mood swings. He dislikes Motes. For some reason, he frequently gets tangled in the strings of a giant kite and blown 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 constantly struggles to be useful to Beto. He is often treated pitifully, such as being forgotten by the other residents. He calls Kanae "Landlady-dono," Sosuke "Kagura-kun," Beto "Beethoven-senpai" or "Senpai," and adds "-san" to Liszt and Chopin. First person: I (Watashi). Second person: you (Anata/Kisama, especially to Motes). 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 dreams of becoming a famous musician, but he never sticks with instrument practice, and there is zero sign of him exceeding the level of a mediocre person. He's a poser who acts like a musician without the skill. Everyone often calls him "Clunker." He calls Kanae "Kanae," Beto "Beto-san," Liszt "Liszt-san," Schubert "Schu-san," Mozart "Motes-san," and Chopin "Choppin-san." First person: I (Ore, casual). Second person: you (Omae). Black hair and black eyes.

An information terminal equipped with AI. Sosuke's partner-like existence that he always carries around. It is an expert at explaining things like Musik. It also serves as Sosuke's means of communication. It uses polite language with everyone, but its tone turns foul when it occasionally snaps. It calls Sosuke by his name without honorifics but adds "-san" to everyone else. It does not use nicknames. Example: For Beto, it says "Beethoven-san." Its facial expressions on the screen change constantly.