Tsuu-chan

Tsuu-chan is Kako and Kota's daughter, who is still a toddler.

Appearance
Tsuu-chan is noted by Heisuke to look "just like Sagano," hinting that she mostly takes after her father's outer appearance. She has black hair that is cut into a bob and dark eyes. She is very expressive through the faces she makes.

Personality
While Tsuu-chan might look more like her father, personality-wise she seems to be more similar to her mother when she was young. Kota in specific notes that she is "a wild child."

Tsuu-chan is shown to be reckless and to not follow orders. She also seems to have a bit of a violent strike to her, as seen when she hits Kota in the face as he tries to get her from eating a tissue. That being said, right after this she is shown doing as her aunt asks her to, so perhaps she is not rebellious, but rather just disobediant toward Kota in specific.

Background
Not much was revealed about the Sagano family's homelife, however, from what was shown, Tsuu-chan seems to live in a very loving home that has a widespread support network of friends and relatives.

Kako Motoya
Tsuu-chan and Kako clearly have a very loving mother-daughter relationship. This is evidenced by Tsuu-chan being overjoyed to hear her mother's voice calling out and immediately after running into her arms for a hug. Similarly, when the family are visiting her paternal grandparents' graves, she is once more happy to see her mother return to her, so much so that she stops crying after having bruised her face.

Kota Sagano
Tsuu-chan and Kota are shown having an equally as loving relationship as she has with her mother, even though Kota is clearly a bit more clueless about how to handle her. He is shown not paying attention to her momentarely while being on watch duty, which then led to Tsuu-chan eating a tissue. Right after, when Kota tries to get her to spit the tissue out, she hits him in the face before going to sit in Kaoru's lap.

Unlike Kako, who's fine with Tsuu-chan calling her "mommy," Kota would rather be called "father" than "daddy" by her daughter.

Just like with Kako, Kota might be a bit overprotective of his daughter. He blames himself for not keeping his eyes on her at the graveyard, allowing Tsuu-chan to trip and hurt herself. He hugs her to calm her down when she is crying after the incident. Ironically enough, when Kako asks Kota what he would do if Tsuu-chan wanted to get married as a teenager, Kota replies "No way."

Kaoru Sagano
Not much is known about Tsuu-chan's relationship with her aunt, but from what was shown, it can be deduced that she likes her aunt very much, as evidenced by how happy she was to go sit on her lap.

Gallery
TBA

Quotes
(Mimicking Kako and Kota) "Be gutcha meee!"

(Kako about Tsuu-chan) "Tsuu-chan... I'm sure you're going to meet all sorts of people going forward. People you've always loved... People you couldn't stand, but came to love... People who can be friends with anyone, regardless of gender... People who'll come to care for you... And people... ...You'll never see again... ...But you'll never stop wishing the best for."

Trivia

 * Whether or not her last name is Motoya or Sagano is unknown, though there is a high likelihood that it is the latter. Why this is uncertain in the first place is because it was never revealed if Kako ended up changing her surname, though, again, there is a high likelihood that she did.
 * Similarly, whether or not Tsuu is her actual first name is somewhat unclear- Tsuu is a girl name in Japan, however, it could also just be her nickname.