Noriko Sonozaki

Sonozaki Noriko (園崎 法子, Noriko Sonozaki) is a main character in the Kiznaiver anime. She is a mysterious girl who brings the seven Kiznaivers together (the exception being Hisomu, who she told the other six to find themselves).

Appearance
Sonozaki has grey eyes and long, light blue hair with a braid along the crown.

She wears her school uniform, but different than other girls. It consist streamline blazer and skirt accented with blue. Both her petticoat and the long-sleeved blouse she wears under her blazer appear to have ruffles, adding a girlish touch to her otherwise simplistic look. She wears common black school shoes and thigh-high white socks. In place of what appears to be her school's standard necktie is a pale blue bow. She wears a diamond imprint around her neck, much like a choker necklace. She appears to be around 163 cm.

If one were to assume that she is the other child in Katsuhira's dreams as of late to whom Sonozaki bears a striking resemblance, a noticeable Kiznaiver scar could be seen on the back of her neck.

Episode One and Two
Sonozaki appears 'all of the sudden' and seems to know everything. At first, she gives a very unsettling vibe to the six present Kiznaivers, even causing Maki to call her 'insane.'

Episode Three
After Maki's confession, she tells the Kiznaivers that surviving the summer was their final mission and that after, they would be disbanded. After the Hisomu is found by the other Kiznaovers, she is seen speaking in a conference from about the light specks that appeared, calling it "light shinning from precious bonds"

Relationships
Agata Katsuhira

Despite Katsuhira not recognizing Sonazaki even though the two came from the same year and class section — even going so far as to ask her who she was when they first met, Sonozaki has shown that she may know Katsuhira well, as was hinted when she told him that he "hadn't changed" after she pulls herself extremely close to his face and he tells her that the only times he had been this close to another is when he gets beaten up.

Sonozaki also accepts Katsuhira's "secret", which noted by others was more of a belief than a secret — on the grounds that Katsuhira, himself, had forgotten what it was though, which suggests that she knows what it is though she opts not to tell him or the other Kiznaivers this.

Due to Katsuhira's newfound interest in knowing about himself and connecting with others, it is seen that he wants to know her better perhaps on the grounds of suspicion that Sonozaki is somehow connected to his reoccurring nightmares and flashbacks.

Much to Chidori's jealousy and dismay, Sonozaki calls him by his first name and Katsuhira calls her Nori-chan.

In the latest episode, she is seen taking of her choker to reveal a scar that matches the other Kiznaivers and asks Katsuhira if she exists inside him. She is confirmed to be the girl from his memories.

Takashiro Chidori

The subject of Chidori's jealousy along with Katsuhira Agata due to his and Sonozaki's seemingly newfound relationship, though she adamantly denies this for the most part until Tenga Hajime offers to help her out with her relationship with the latter. With much dismay, she notices Katsuhira's attempts to get closer to Sonozaki and how much he seems to think about or mention her, which ultimately just fuels her jealousy and anger.

Urushibara Mutsumi

It appears that the Guidance Counselor may harbor an obsession over Sonozaki Noriko for whatever reason as she was first introduced with a Sonozaki strap attached to her phone. When called out for hypocrisy as she criticized Yamada Kazunao for selling out his students, she tells him that "Noriko-chan" was the only one she cared about anyway.

Quotes
"Everyone wants to connect with someone else." --To Katsuhira, Episode 1

"Yes, from today, you're all Kiznaivers." --To the Kiznaivers, Episode 1

"Does the smell of a girl excite you?" --To Katsuhira, Episode 2

"Have a bun to calm your buns."

"I was taught to accept others' kindness." --To Katsuhira