Chie Hori

Appearance
Chie has a small body and an appearance of a child even though she is 24. She doesn't seem to age since she has looked the same since she was 16. She has dark brown hair and a lighter shade of brown eyes, however in the light novel's she is illustrated with burnt orange hair and eye's of a similar shade. She is shown wearing a green rain coat and a pink camera.

Personality
Chie has a unique personality. This is due to her first encounter with Tsukiyama as a ghoul. Instead of showing fear and screaming, she let him treat her at a dessert shop, whom later befriends Tsukiyama, who started to call her 'Little Mouse'. She also seems very curious and seems to do anything for a 'scoop'. Yoshimura also warned Tsukiyama to be cautious around Chie as her intentions are hidden.

Days: Photograph
Chie is introduced taking a photograph of Tsukiyama as he feeds on a victim, startling him and triggering a chase. She manages to elude him at first, but is eventually cornered in an alleyway. Rather then responding with fear, she shows him the photo she'd taken and reveals they attend the same high school. She demands that he take her somewhere to eat, and the pair end up at a cafe where she makes him purchase her a dessert. Though Tsukiyama attempts to manipulate her to find out her intentions, she quickly loses interest and states she won't leak the photo after all.

In the following days, Tsukiyama investigates her at school while she goes about her business. She is revealed to have gotten into the prestigious academy on a scholarship, but neglects her grades in favor of constantly looking for interesting things to photograph. Having gotten the scoop she wanted, she is initially uninterested in Tsukiyama, but he presses her further and invites her to accompany him to a nearby hospital.

There, Tsukiyama introduces her to one of the nurses and reveals her elderly patient frequently harasses her, but cannot recall his actions afterwards. Chie snaps a photograph as the old man sneaks up behind the nurse and grabs her from behind, saving it for later. Before they leave the hospital, she is invited to come back at midnight for a special "dinner show". Though wary, Chie accepts the invitation and returns later that night. She hides in the restrooms for some time, and changes into pajamas so that she will blend in with the patients. Once visiting hours have ended, she joins the patients returning to their rooms and sneaks onto the ward visited earlier. She sneaks into the old man's room, making note of the massive private room and expensive, unopened gifts. When the nurse enters the room, she hides underneath the bed.

As she hides, she hears the nurse begin to abuse the old man, insulting and hitting him. Tsukiyama breaks through the window, startling the nurse and chiding Chie for failing to open the window for him. Chie emerges from beneath the bed, and watches the scene as he declares his true identity and begins to remove the old man's skin. Eventually, the old man wakes up and begins to struggle, begging the nurse to save him. As she begins to viciously kick the old man, Chie takes a photograph of the abuse.

Amused, Tsukiyama catches Chie by her shirt and holds her out the 8th story window, threatening to drop her. Rather than plead for her life, Chie calmly takes another photograph of Tsukiyama as he prepares to kill her. This intense focus further amuses Tsukiyama, and he lifts her back into the room while declaring that she is clearly a very amusing pet. Chie refuses, but is immediately ignored. She then reveals to Tsukiyama that she had prepared for the possibility of being killed, and has a blog post set for 1am that will reveal his identity if she does not cancel it in time. The pair climb out the window, leaving the injured old man and the nurse behind.

Weeks later, Chie and Tsukiyama meet in a cafe to discuss the events of that night. She shows him on her laptop the news, and how the nurse had reported an unknown Ghoul had attacked her and then killed her elderly patient. As a result, she has become the "heroine of the tragedy" and become romantically involved with a doctor. Chie reveals she went to see the nurse afterwards, and tells Tsukiyama that the nurse is grateful to him for her good fortune. Looking at the photograph again, she notes how the nurse looked at her patient as if he were an insect to be crushed. He expresses amusement at the cruelty of humans, and Chie takes another photograph of him as he smiles.

Raid of Kanou's Lab
While she never appears in person, Chie is mentioned by Kaneki in conversation. He refers to her as a "reliable person" after she obtains the list of prisoners that Aogiri Tree freed. Itori suggests this information could only be obtained by hacking CCG's database.

Later, when Tsukiyama tells the story of the Yasuhisa family, he mentions that he was given this information by Chie.

Torso Investigation
Chie is first glimpsed sitting on a ledge, watching over Kanae and chiding him for his behavior.

She later approaches Kuki Urie and Ginshi Shirazu, offering them information on Torso. They are initially suspicious, since the identities of Investigators are closely guarded and threaten to take her in for interrogation. Unconcerned, Chie warns them that she'll simply provide the bare minimum of information and won't cooperate further. Instead, she offers to sell them photographs in exchange for either 1 million yen or one of Haise Sasaki's personal belongings. She claims to want it for her "model", in order to cheer them up and make them interesting again. Urie agrees to her terms, but asks for the photographs of Torso's hunting grounds beforehand. She hands them over, with the rest of the information withheld until her price is met.

Days later, Chie meets with Urie and Shirazu to complete their business. She is given a pair of Sasaki's underwear, and gives them polaroids she believes Torso took before killing his victims. She explains to them the different brands of instant cameras, and demonstrates that the brand "Immortal" has a special quality, with faded colors. Chie photographs the pair with two different cameras, revealing that Torso has been using Immortal-brand film and notes that it is a foreign brand that has to be ordered from a specialty store. She tells them their suspect must live near the crime scenes, and has recently ordered a large amount of the film from a store -- she knows of one suspect that fits.

Trivia

 * Chie has been associated with the number 0 by Tsukiyama. This is a reference to the tarot card The Fool.
 * “So we can’t determine if she’s an idiot or a sage. Like the Tarot’s number 0 - The Fool" - Tsukiyama