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Fukumaru

The titular cat adopted by Kanda. He’s a 1-year-old Exotic Shorthair.
- Gonk: He goes un-adopted for so long because he's seen as fat and ugly. One visitor even calls him "snotface". Kanda on the other hand believes Fukumaru is adorable.
- Green-Eyed Monster: He hates the piano. He thinks that it takes "Daddy's" attention from him. Sitting on top of it gives him power and vindication.
- Strong Family Resemblance: He bears a striking resemblance to his mother and sister despite the difference in fur colors and patterns.
Fuyuki Kanda

Fukumaru’s owner. A widowed, retired famous pianist now teaching at a children’s music school.
- Childhood Friend Romance: He met his wife when they were both children.
- Cool Old Guy: He’s a kind-hearted, caring, and talented pianist and music teacher with an adorable cat. More than one character remarks on how handsome he is, too.
- Living Legend: Is regarded as one of the top four globally renowned pianists.
- Ring on a Necklace: His wife insisted that he wear his ring on a necklace due to working with his hands as a pianist. After her passing, he wears both rings on the necklace.
- Silver Fox: He’s a pretty good looking guy and his younger female colleagues fawn over him, despite his age.
- Single-Target Sexuality: To Moriyama’s shock, the only person Kanda dated was his wife. He has no interest in finding another partner.
- The Mourning After: He had a lovely wife, but after her death and the kids moving out he's become depressed and lonely. Fukumaru coming into his life changed that; now while he doesn't think to move on with another woman, he has a fulfilled love in taking care of the big cat.
Mrs. Kanda
Fuyuki Kanda’s deceased wife.
- Childhood Friend Romance: She met her husband when they were both children. She even recalled the first time he performed for her during their childhood.
- No Full Name Given: Her first name is yet to be revealed.
- Posthumous Character: She has been dead for a while, but it was her suggestion that lead to Kanda adopting Fukumaru.
Natsuhito Kobayashi

Kanda’s best friend. A dog person who dotes on his Shiba Inu, Chako.
- Animals Hate Him: Cats, particularly Fukumaru and Marin, are not fond of him. At least his dog Chako doesn’t mind him.
- Childhood Friend: He befriended Kanda supposedly in grade school. Their friendship has lasted for more than forty years.
- Defrosting Ice King: He’s introduced as an arrogant dog lover, resenting cats and immediately calling Fukumaru ugly when Kanda sends him a photo. By his second appearance, he realises how insensitive he was and apologizes to Kanda with cat food. After that, he does make an effort to bond with Fukumaru despite the latter’s annoyance.
- Jerk with a Heart of Gold: He may be pushy and insensitive, but he does genuinely care about his best friend’s wellbeing and makes an effort to bond with Fukumaru.
- Mistaken for Cheating: Happened before the story's events. He claims that his wife got the wrong idea, but Kanda doesn’t fully believe him. Whatever happened between him and his wife was resolved through talking and meeting halfway.
- Took the Wife's Name: He had taken his wife’s family name, so his legal name is Natsuhito Takamido. However, that doesn’t stop Kanda from referring to him as Kobayashi.
Yoshiharu Moriyama

Kanda’s colleague at the music school. He teaches guitar lessons and dreams of becoming a famous guitarist.
Momiji Sato

A clerk at the pet shop Fukumaru lived in.