Rize Kamishiro

Rize Kamishiro (神代 利世, Kamishiro Rize) is a ghoul who escaped from the organization V, and the foster daughter of Matasaka Kamishiro. She is known under her nickname Binge Eater (大喰い Ōkui, Binge Eater or Gluttony, literally Big Eater). Because of her eating habits, Rize was a threat to most ghouls in various wards in Tokyo. She is the donor of the kakuhous that were in the transplant surgery used to transform Ken Kaneki, Kurona and Nashiro Yasuhisa, and Kichimura Washuu into one-eyed ghouls.

Appearance
She appears to be a shy, slender girl with long purple hair, purple eyes, and an hourglass figure. As a ghoul blending into human society, she wears a normal attire fit for a young woman, showing a bigger preference over dresses. After she had moved to the 20th ward, she was seen wearing a pair of red frame glasses (the frames being only at the lower half of the lens), even though she does not seem to have any eyesight problems. Her attire reveals some cleavage, possibly to seduce and allure males as her prey. Rize is very attractive and is aware of this fact, often manipulating it to her advantage.

In her younger days, she had shorter hair.

Personality
Rize is a voracious, independent ghoul who acts as a femme fatale to those who fall victim to her charms. She is an enigmatic female with many acquaintances whom are left with a mysterious impression of her and those who come into conflict with her rarely come out alive, with the exception of Banjou, who finds her self-dependence and strength attractive. She has no ambitions and wanders the wards aimlessly to appease her boredom.

After she is rescued by Renji Yomo, it is shown that the effects of captivity and starvation have reduced her into a near-mindless state, as she is unable to recognize her surroundings and has to be kept in restraints. This also brings out a vulnerable side of Rize as she cries out to her foster father in fear.

Past
As a child, she escaped from the Sunlit Garden with the help of Souta Washuu-Furuta, which left her exhausted and hungry. She was found by Shachi, who decided to take her in his care. She grew close to Shachi, seeing him as her surrogate father. However, as Rize grew, so did her appetite. She began overeating, and despite Shachi's protests, continued doing so. Her actions eventually resulted in a CCG raid in the 6th ward and Shachi's capture.

Rize would then begin living nomadically, drifting through the different wards while continuing her binge-eating habit. Six months before the Steel Beam Incident, Rize Kamishiro lived in the 11th ward. Her activities attracted the attention of the ghoul investigators and made them move into that ward. She decided to leave when the ghoul investigators started to act. Before she left, she killed Hagi, the leader of the ghouls in the 11th ward, and two others.

Prologue
Rize targeted Ken Kaneki, who she noticed had a crush on her, engaging him after frequenting Anteiku for a while. Using their mutual love of books to her advantage, they planned for a date soon after meeting. They spent the day together with nothing out of the ordinary happening until that night. Feigning fear, Rize tricked Kaneki into escorting her back home down a deserted area where she revealed herself to be a ghoul.

Kaneki struggled against her, but Rize was too strong and easily pierced him in the abdomen with her kagune. Before Rize could finish him off, multiple steel beams from the construction area above fell onto Rize, crushing her. The disturbance was heard by a passersby, who then called for help, and both were sent to Kanou General Hospital. There, Professor Akihiro Kanou pronounced Rize too far gone and decided to transplant her organs into Kaneki without contacting their relatives, given the urgency of the situation. However, he secretly kept her alive to use for his experiments.

In the anime, a hallucination of "Rize" haunted Kaneki when he was hungry and trying to fight his ghoul instincts.

Aogiri Arc
During Yamori's torture sessions, Kaneki began seeing a hallucination of "Rize," who helped him embrace his ghoul side and eventually beat Yamori. It was in this period of time when Kaneki had a flashback about his mother and how she eventually died from over exhaustion. They conversed about what the "right" thing to do was, until Kaneki denounced his mother's way of life and "devoured" "Rize's" strength.

Raid of Kanou's Lab
Since the accident, Kanou kept Rize alive in a tank to harvest her kakuhou for his research. Kaneki and Shachi eventually met her during their battle. As Kanou tried to persuade Kaneki to join Aogiri Tree, her tank was destroyed and she was rescued by Renji, per the agreement made between Yoshimura and Shachi to keep her safe.

Owl Suppression Operation
After the incident at the lab, Rize was kept in a container inside Renji's living quarters. She was restrained by chains and kept in a constant starving state, only fed enough to survive and not enough to regain her strength. This made her mentally unstable and unable to recognize her surroundings. Kaneki eventually found her in this state, which prompted him to reevaluate his decisions.

During the Owl Suppression Operation, Rize appeared as another hallucination to Kaneki in the sewers, but unlike before where she was coherent and humanized, she became a deformed and monstrous entity who tried to eat him.

Post-Owl Suppression Operation
Rize was in the process of her recovery just after Sen Takatsuki announced she was a ghoul.

Clown Siege
She is mentioned by Kaiko to have a connection with the CCG Laboratory Division and that it is a classified issue that has not been made public.

Post-Clown Siege
Rize reappears later being shown to have been captured and kept in a tank by Kichimura Washuu who uses her as donor to farm her kakuhou for making Oggai.

Ken Kaneki
Rize was attracted to Kaneki because of his delicious appearance and himself. Both of them shared many interests. After their date, Rize tried to hunt him down, but failed. At the end, he, heavily injured, went to a hospital, where Dr.Kanou decided to transplant her organs into him.

A hallucination of Rize appears to Kaneki earlier in the anime, representing the subconsciousness of Kaneki's ghoul half. "Rize" usually haunts Kaneki when he is hungry and needs to eat human meat.

Matasaka Kamishiro
As a child, Rize looked up to Shachi, whom she saw as a father. However, as Rize reached adulthood, her binge-eating habit earned her Shachi's rage, and further strained their relationship, and resulted in arguments between the two. She is implied to have caused her foster father's capture, showing she no longer cares for him. However, in her half-crazed starving state, she apologized to her father. On his side, he still considers her as his daughter.

Kichimura Washuu
Furuta and Rize knew each other as children. Furuta helped her escape in order to save her; however, Rize appears to not hold much value about his aid, enjoying the freedom she had gained. Because of this, Furuta punished her by dropping the steel beams on her. It is unknown what she thinks of him at the current time.

Akihiro Kanou
Rize was pursued by Kanou to become a donor in his experiments to create artificial one-eyed ghouls. He took an interest in her because her kagune was unusually vigorous, though their history prior to Kanou kidnapping her is unknown. Kanou treats her incredibly inhumanely, imprisoning her and starving her.

Kazuichi Banjou
Banjou had one-sided romantic feelings for Rize, whom did not care for him at all. He searched for Rize in the 20th ward soon after learning she had supposedly died.

Powers and Abilities
Ghoul Physiology: Living as a ghoul, Rize possesses high physical capabilities along with a rinkaku kagune. Rize is considered strong even among powerful ghouls, and her kagune is well capable of taking down multiple opponents in one go.
 * Rinkaku Kagune: Her kagune is special because it has an abnormal regenerating factor even among the rinkaku types. She is able to summon up to six tentacle claws. While slim, each claw can cut deeply enough to fatally injure anyone effortlessly, human or ghoul. Yoshimura explained, despite having a superior cellular regeneration, if sufficient damage harms her vitals then even with a fast recovering body it would not regenerate from fatal wounds; like the steel beam that crushed her waist and ultimately led to her "accident."

Trivia

 * In the first character popularity poll, Rize was ranked eighth. In the latest, she came in as twenty-first.
 * Sen Takatsuki's The Black Goat's Egg was a book Rize and Kaneki liked reading from Chapter 1. Coincidentally, the book's setting and characters shows a resemblance of the two. Rize is similar to The Black Goat that has a gluttonous appetite for humans, and Kaneki, who was transplanted with Rize's organs, can be interpreted as The Black Goat's son. Kaneki's experiences in the ghoul world and the struggles with his ghoul nature show a parallel to the book's protagonist.
 * In the anime, Rize shows up to Kaneki several times as a hallucination whenever he was hungry or struggling against his ghoul instincts. In the manga, the hallucination of Rize does not come to Kaneki until he has been tortured and is mentally at his lowest.
 * In Tokyo Ghoul Trump, she is featured as the "Queen of Hearts" along with Ken Kaneki.
 * Sui Ishida has stated Rize is his type among ghoul women.
 * Rize shares the same birthday with Hooguro.