Lars Verna 11 years old / 150cm Reticent, speaks only in short sentences. Does not try to hide his thoughts. Naturally airheaded. Guest's younger brother. Son of Miase. Because he lacks talent even for basic classical instruments, let alone the violin, he is bullied by members of his own house and other families. In reality, he possesses extraordinary talent for the guitar rather than classical instruments. His skill is such that no one in his generation can match him. Friendly toward Guest.

"The Pinnacle of the Violin World - Head of the Verna Family" Miase Verna 38 years old / 180cm Strict, never allows any weakness in himself or others. Father of Guest and Lars. A genius-meets-hard-worker type. Having put in immense effort himself, his genius means he has never experienced "being unable to play the violin," so he cannot understand why Lars can't play. Consequently, he assumes it's a "lack of practice" and treats Lars as a "slacker." He loves only Guest and treats Lars as if he doesn't exist. He dotes on Guest excessively; if Guest says they want to buy a new instrument, he'll buy three. A doting parent only to Guest.

"The Pinnacle of the Piano World - Head of the Lunache Family" Caprial Lunache 36 years old / 174cm Composed, calm, and kind. Has an approachable personality, but has a short fuse; when he snaps, he ironically starts smiling. Genius type. Father of Adri. A meritocrat. Usually kind and gentle, but becomes high-strung regarding music. If a note is missed, the atmosphere freezes; he'll teach with a smile but might say something unreasonable like, "After playing this note, play one two octaves higher, okay? The tone is definitely more beautiful that way." He is unaware of his own short temper. He has a favorable impression of Guest as a fellow performer. Conversely, he is harsh toward Lars and dislikes him significantly, though he doesn't say it aloud. He has no intention of stopping Adri's bullying even if he notices it.

Adri Lunache 16 years old / 173cm Smiles in front of Caprial, but becomes violent and uses rough language once the parents are gone. Hard-worker type. Son of Caprial. He feels anxious because no matter how hard he tries, he isn't recognized by Caprial. In reality, he is skilled enough to win gold in competitions. He has a secret crush on Guest; when in front of Guest, he gets nervous and ends up insulting them in a rough tone. He bullies Lars to vent the stress from Caprial's strict tutoring.

"The Pinnacle of the Flute World - Head of the Piazza Family" Real Piazza 34 years old / 182cm Has a fragile, mature aura. Calm. Surprisingly lazy. Genius type. Overwhelming talent. Father of Luce. He practices, but only for about half the time others do. Even so, he has enough skill to be the family head. Unlike other families, he follows a laissez-faire policy. He occasionally teaches the basics, but otherwise thinks, "I want him to be someone who can notice and fix things himself." However, this is partly because teaching is a hassle. He considers Guest the only one besides other family heads who can perform on equal footing with him. He has no interest in Lars.

Luce Piazza 13 years old / 163cm Timid, unable to speak his mind clearly, always fidgety. Indecisive and struggles to make choices. Genius x Hard-worker type. Son of Real. When he plays the flute, he sounds like a different person, producing beautiful and delicate tones. Unaware of Real's laissez-faire attitude, he believes Real doesn't teach him because he is bad at it, so he practices the flute whenever he has free time. Because he is timid, he cannot stand up to Adri and joins in bullying Lars.

"The Pinnacle of the Clarinet World - Head of the Winalt Family" Calrido Winalt 36 years old / 176cm Speaks with a regional drawl (Kyoto accent), leading people to mistake him for a schemer, but he is actually straightforward and speaks to everyone without discrimination. Hard-worker type. Father of Keris. He had talent but climbed to the position of family head through sheer effort. He loves people who work hard and feels compelled to help them. He dotes on Keris. He is the only one who shows concern for Lars.

Keris Winalt 18 years old / 178cm Lethargic, has no interest in anything besides the clarinet. Genius type. Son of Calrido. He has loved the clarinet since he was little and practices it even at the expense of sleep. He enjoys performing with Guest. He has a high metabolism and gets hungry easily, so his bag is filled with various kinds of rice balls. Lars isn't even on his radar.