I wanted things to continue like this forever. I didn't want this comfortable situation to change. But in reality... I don't want anyone else to have it.
|― Ichika to Yotsuba about her real feelings, Chapter 66|
Ichika Nakano (
Ichika is a girl with very short hair that has a single long strand on the right side. She has white-pink hair colour, ranging from oyster pink to light pink shade in Volume 1, and oyster white to light pink shade in Volume 4. Her notable accessory is a single earring. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure and large breasts. A stall owner praises Ichika for her cuteness, but she doesn't praise her sister nearby, Itsuki Nakano. 
Ichika acts as the eldest sister of her sisters, as she seems to have a calm and composed demeanor; making herself an approachable person. Fuutarou Uesugi noted that her smile is fake and encourage her to put away that kind of smile.
She initially had pessimistic attitude towards the sisters' learning capabilities, making her one of the obstacles for Fuutarou tutoring lessons early in the story. After being inspired by him, she began to change her mind and started to take studying seriously. He also helped her fix any issues she had with her sisters; making them closer than ever before. Despite her smug expression and teasing behaviour, Ichika is shown to have a weakness to romantic moments happening to her; blushing whenever thoughts about it came to her mind.
According to Fuutarou, each of the Quintuplets have their own characteristics regarding their sheets. On Ichika's case, her writing and paper would be sloppy. She was also remarked to pick things up quickly and is troubled when her sisters make decisions without her presence.
As her pride of being the eldest sister, she plans to be successful first before telling her sisters about the job. She is shown to study in between her filming; whether it be inside a car on the road or late at night. Fuutarou was also impressed at how she was able to balance her work and school.
Ichika is a model and an actress. She is able to impersonate her sisters' expression and traits, showcasing her excellent acting capability, but to not to the extent of Miku, in which she can impersonate them flawlessly. Fuutarou is usually left impressed at how good her acting is, like when she accidentally eats the cake made by him, but managed to praise it wholeheartedly.
She is hinted to have good insight about human psychology, as she is able to, "see through people." This is evident when she easily deduced Fuutarou' and Itsuki's quarrel, and correctly guessed the state Itsuki she was currently in.
Ichika's "big sister" traits are first shown when she refers to herself as "onee-san" to Fuutarou and asks him to consult her. Among the sister, she is ranked in the middle part of the five, with Mathematics as her strongest subject.
- Main Article: Ichika Nakano/Relationships
She has always been awkward. So she probably just has trouble being honest about how she feels? I'm sure she's struggling by herself even now. I'll try doing what I can. But there are things that only Fuutarou-kun can do.
|― Ichika discusses with Fuutarou Uesugi about making up with Itsuki Nakano|
- Yotsuba Nakano: “Don't feel like you should be the only one holding yourself back. Just do whatever you want to do... I guess!”
- Ichika: “What I want do to...?”
- Ichika's monologue: “I wanted things to continue like this forever. I didn't want this comfortable situation to change. But in reality...”
- Ichika: “I didn't want anyone else to have it.”
- — Ichika to Yotsuba about what she wants, Chapter 66
I've been trying to fool everyone, but I'm concerned about my savings. I mean, stuff like food and utilities cost more than I expected. So I've decided to take on any roles, no matter how minor they might be. I need to work hard, for both my sake as well as theirs.
|― Ichika to Fuutarou Uesugi about her reasons to work.|
Unsociable, tactless, and just plain mean. Why did it have to be you of all people?
|― Ichika on her love toward Fuutarou Uesugi|
- The name Ichika means "one" (一) (ichi) and "flower, blossom" (花) (ka).
- Ichika's notable accessory is a single earring, representing number 1, which is a part of her name and the order of her birth.
- Ichika's voice actress Kana Hanazawa is the oldest among the voice actresses of the Nakano Quintuplets.