Rize Kamishiro

Rize Kamishiro (神代 利世, Kamishiro Rize) is a ghoul that was hanging out at Anteiku. She set her eyes on Ken Kaneki, but moments before eating him, she was injured in an accident and her organs were transplanted into Kaneki, making him half-ghoul.

Rize is also known under her nickname Binge Eater (大喰い, Binge Eater or Gluttony, literally Big Eater). Because of her eating habits, Rize was a threat to most ghouls of the 11th ward and 20th ward.

It has been revealed that her name may be fake by Itori. Her relation with Matasaka Kamishiro is unclear.

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.

Past
Six months before the steel frame accident, Rize Kamishiro lived in 11th Ward. Her activities attracted the attention of the ghoul investigators and made them move in that ward. She decided to leave when the ghoul investigators started to act. Before she left, she killed Hagi, the leader of the ghouls of 11th Ward, and two other ghouls.

Before she arrived in the 11th Ward, she also spent time in the 17th, 18th, and 6th Wards. She seems to have been acquainted with Orca.

Prologue
Rize targeted 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 struggles against her, but Rize is too strong and easily pierces 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 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.

In the anime, a hallucination of Rize haunts Kaneki when he is hungry and while 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 is in this period of time when Kaneki has a flashback about his mother and how she ended up dying from over exhaustion. They converse about what the "right" thing to do is until Kaneki denounces his mother's way of life and "devours" Rize's strength.

Raid of Kanou's Lab
Ever since it was revealed that doctor Kanou was purposely making artificial One-Eyed Ghouls and that Rize was somehow involved, Kaneki began searching for answers. He eventually located Kanou's secret laboratory where he found that Rize was still alive, hooked up to a machine that farmed her kakuhou, so that Kanou could continue his experiments. Before Kaneki and the others knew it, Renji Yomo bursts in and rescues Rize, making off with her.

Anteiku Raid
After the incident at the lab, Kaneki sought Renji, who was living in a storage container, to question him about Rize's whereabouts and Yoshimura. He hears Rize near by and goes to search for her despite Renji's protests. He sliced open another container with his kagune to find Rize inside, however she was in a state of extreme hunger and mental instability to the point that she couldn't recognize anyone so was kept bond. While in her starving state, she helplessly struggled from her confines pleading for meat and called her father.

During the Anteiku Raid, Kaneki had another hallucination of Rize while hiding out in the sewers, but unlike before where she was coherent and humanized, she became a deformed and monstrous entity who tried to eat him.

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. She usually haunts Kaneki when he is hungry and needs to eat human meat.

Matasaka Kamishiro
Little in known about their relationship, other than they share the same surname (with a different spelling) and that Matasaka may have been captured by the CCG because of Rize.

Souta
After Kaneki's defeat during his battle with Arima, it was revealed during his flashbacks that it was Souta, who is part of the clowns, who let down the steel beams on Rize, causing her "death". She seems to know him before she came to the 20th ward.

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.

Kazuichi Banjou
Banjou had one-sided romantic feelings for Rize, whom didn't care for him at all. He went searching for Rize in the 20th Ward, but soon after learning that she had "died".

Powers and Abilities
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 wouldn't regenerate from fatal wounds; like the steel beam that crushed her waist and ultimately led to her 'accident'.

Trivia

 * She was ranked 8th in the character popularity poll.
 * 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 child. 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's hungry or struggling against his ghoul instincts. In the manga, the hallucination of Rize doesn't come to Kaneki until he's been tortured and is mentally at his lowest.
 * In Tokyo Ghoul Trump, she's featured as the "Queen of Heart" along with Ken Kaneki.