Kurona Yasuhisa

Kurona Yasuhisa (安久 黒奈, Yasuhisa Kurona) is an artificial one-eyed ghoul who impeded Ken Kaneki's pursuit of Madam A alongside her twin sister Nashiro.

After being abandoned by Akihiro Kanou, she vanished until her reappearance during the Rushima Landing Operation. She merged with her sister, having become the gruesome creature known as Floppy (フロッピー, furoppī).

Appearance
Nashiro and Kurona are identical twins. When they were children they both had light colored hair and dark eyes. However, after being experimented on by Kanou and made into half-ghouls they both received a kakugan. Kurona's kakugan is in her left eye with a small dark mark beneath it. Kurona's hair became black, while Nashiro's became white sometime between the experiment and the present. Her usual outfit is a long black cloak with a hood. On top of the hood are two white circles that resemble an eye. Her ghoul mask is a simple black and white vertical striped mask with a hole in the left eye.

In Tokyo Ghoul:re she wears a long hooded robe. Her hair has become a lighter color like when she was younger and has grown out. She has two kakugan and her arms and torso are now partially covered in grotesque dark coloured flesh and on her stomach is a deformed face that appears to be able to speak albeit incoherently.

Personality
As a child, Kurona was very cheerful and sanguine until she witnessed the brutal murder of her parents at the hands of a ghoul. The trauma caused by their deaths has caused Kurona to become cold, distant and relatively nihilistic. She decided to become a ghoul because she considered being human and living in the current " twisted world" to be the cause of her misfortunes. Her misanthropy is the result of Akihiro's manipulations.

The one thing that Kurona cherishes more than anything is her sister Nashiro which has strengthened since their parents' death. She is willing to put aside any kind of mission or objective if her sister is in danger. She is willing to even disregard her vendetta against the world and disobey Kanou's instructions to save her sister's life after Nashiro was almost fatally injured by Suzuya.

Past
Kurona was born into a wealthy family and they lived happily together in a lavish mansion. As a child, she dreamed of becoming a chef and opening her own restaurant. Her happiness was cut short however when a ghoul broke into her home and brutally murdered her parents in front of her and her twin sister. Following her parents' murder, she and her sister were immediately taken into CCG custody where they became wards attending their academy.

Like many children orphaned by ghouls, she wanted to become a ghoul investigator and did well in her courses. When Kurona was fifteen, she began sharing classes with Juuzou Suzuya, who at the time still went by Rei. She and Nashiro found him strange, but tried to get along with him regardless and disliked how others spread rumors about him and used them as an excuse to ostracize Juuzou. It was also during that time she met Koutarou Amon who visited as a guest lecturer. Kurona and her sister quickly built an admiration for Amon and spoke to him after class. They asked if women could become ghoul investigators and Amon assured them that they could. He named a few noteworthy female investigators, two of them being Kasuka Mado and Kiyoko Aura. They were curious about Mado, but Amon tells them that she was killed in the line of duty. Kurona heard the term "one-eyed ghoul" for the first time. Shortly after Amon's lecture, one of Kurona's friends, Shizuku Kawakami, died of illness. While mourning, she and her sister went for a walk in the woods where they found Juuzou. They wondered if he was sad about Shizuku and were disturbed over his weak grasp of life and death. Kurona noticed that Juuzou was covered in blood and learned that he was the one responsible for the spree of animal killings. At some point afterward, they disappeared. Unbeknownst to their peers, they were manipulated by Kanou and later became subjects of the same experiment that Kaneki went through. After this point, the twins would refer to Kanou as their father.

Raid of Kanou's Lab
Kurona and her sister accompanied Madam A to the Ghoul Restaurant as her bodyguards as Kanou had predicted that Kaneki might target her. They fought Kaneki and when she and Nashiro used their kagune together, they were able to block his attack and push him back. After she exposed her kagune, it was immediately recognized as the same as Kaneki's; it is a kagune derived from Rize. After Madam A escaped, she removed her mask showing her single kakugan, confirming that Kanou was still performing experiments.

During Kaneki's investigation into Kanou, Kurona was requested by the doctor to protect Madam A and was consequentially staying at her residence. When Madam A went to check up on her children, Kurona went with her and attempted to protect her during Kaneki's group's attack. When they encountered Kaneki, she abandoned Madam A on the orders of Kanou.

After Kaneki and his gang apprehended Madam A, they located Kanou's hideout and infiltrated his secret laboratory. They encountered Kurona and Nashiro waiting for them, but Kaneki slipped past to let the others take care of them. They fought Shuu Tsukiyama, annoyed all the while as they found him pretentious, but strong. Just as they began to fight more seriously, Naki swooped in and accidentally saved Tsukiyama. Aogiri had arrived and between them and Kaneki's gang, they wondered what to do.The fight halted until Naki attacked Tsukiyama and the fight commenced between Aogiri and Kaneki's gang. However, Eto slipped by and the twins went after her. They followed Eto to an isolated location where she taunted and spoke to them about their past. Kurona and her sister repeatedly tried to attack Eto, but she dodged them so quickly that the twins could not see her. Eto dug at their painful past, what they had done to their bodies, and how they fell for Kanou's manipulation until they collapsed from mental and emotional anguish. Shortly after CCG's arrival at the lab, the twins ran into Juuzou Suzuya, a familiar face from their days in the academy. Following a brief exchange of words, the twins then engaged him in a skirmish. Juuzou fought against them, reveling in how fun it was and wanting to see their guts. However, Juuzou became too laid back and the twins were able to slash his abdomen open. Juuzou was able to see his own guts instead. He flailed around and appeared too injured to fight, so the twins attacked again, asking Juuzou not to think badly of them. It was an act, however, and as they approached, Juuzou stuck a knife in Kurona's kakugan. Juuzou was able to seriously wound Kurona with his stash of Scorpion 1/56 knives, leaving her almost helpless. Nashiro came to her aid but Juuzou used his quinque to nearly kill her. As Kurona rushed to her sister's rescue she remembered why she chose the path she did. She remembered Kanou speaking to her about her parents' deaths and who revenge should be sought on. Kurona and Nashiro discarded their humanity so that they could have the power to seek revenge. She remembered the day they underwent their operation. They held their hands the entire time to not feel scared. Just as Kurona reached her sister, they clasped hands and Juuzou severed Nashiro's arm at the forearm. Nashiro collapsed onto her and Kurona debated with herself over what to do before deciding to flee to find Kanou. On the way, Kurona stopped to rest in a hallway where Amon eventually passed by and noticed her. She turned around to face Amon and they instantly recognized each other. Kurona ran as Amon called after her. She arrived at Kanou's hidden security room hoping the doctor could save Nashiro. There she found him with Eto and Matasaka Kamishiro. Kanou stated that Nashiro's damage was beyond recovery and that they should leave her. Despite the terrible news, he smiled and said that she would make many new friends. Kurona, shocked, fell to her knees. Kanou then left with Aogiri. After an unknown amount of time, Kurona decided to absorb Nashiro into her own body, allowing Nashiro to live as a parasitic entity inside her body

Rushima Landing Operation
Much later, Kurona appeared at Rushima late into the CCG's invasion. She encountered Hanbee Abara after he had successfully injured Miza Kusakari. She then asked him if he was one of Juuzou's grunts, while two of her kakugan were active. Subduing Hanbee, Kurona asked him as to why he would follow someone like Juuzou, stating that he would just abandon him. Hanbee disagreed, saying that Juuzou would never leave behind his subordinates. Juuzou came up behind her and attempted to strike her with 13’s Jason. Managing to evade his attack, Kurona and Juuzou began their clash. In the middle of dodging, the rest of Suzuya Squad appeared behind her and Kurona blocked their attacks. She felt excited because she could show Nashiro, Juuzou's pain. He asked Kurona if Nashiro was able to live after sustaining such wounds. To show him Nashiro, Kurona removed her cloak. Beneath contained a deformed face on her stomach with the ability to speak. Nashiro struck Juuzou's chest, piercing the quinque armor and breaking 13's Jason. She continued fighting Suzuya Squad while contemplating why they were unconcerned about Juuzou's death, believing that Suzuya Squad never cared about Juuzou. To her surprise, Suzuya Squad jokingly disagreed with her. Suddenly, Juuzou ambushed her and revealed that he recovered from the previous attack, wearing Arata Joker. She attempted to subdue Juuzou with her claw-shaped kagune but was immediately overwhelmed. Her arms and legs were repeatedly lacerated by Juuzou. Enraged and unable to fight back, she fled.

Wandering around the island after fighting with Juuzou, Kurona eventually found Kanou, who greeted her as she bowed and welcomed him back. With Kanou standing before her, Kurona requested him to save Nashiro. Kurona attempted to prove that Nashiro is alive, but is enraged when Kanou told her that Nashiro is long dead. Confronted by Kurona, Kanou released Okahira from a capsule to test which of his creations is better.

Nashiro Yasuhisa
Kurona's younger twin sister. Ever since they were left as orphans as children, they formed a tight, inseparable bond.

Akihiro Kanou
The doctor who performed the Kakuhou Transplant Surgery on her and her sister. He manipulated Kurona into thinking that he cared about her and referred to him as "papa". This pseudo father-daughter relationship was ultimately short lived when Kanou abandoned Kurona after Nashiro was fatally wounded by Juuzou.

In Re:, Kurona no longer has any fatherly affections towards Kanou and only see him as a tool to help Nashiro regain her body back.

Juuzou Suzuya
A former classmate from the academy, Kurona found him very strange and disturbing. Sometime after the academy, she met Juuzou in Kanou's underground lab where she finds him as disturbing as ever and is shocked to learn that the CCG let him become a Ghoul Investigator. After Nashiro was fatally wounded by Juuzou, Kurona sought revenge on Juuzou, desiring to inflict as much pain as possible on Juuzou for Nashiro's sake.

Koutarou Amon
Amon occasionally went to Kurona's academy to give lectures. She respected him as a teacher and would approach him after class for advice. They ran into each other in Kanou's lab and she fled.

Ken Kaneki
The prototype who Kanou experimented on before performing the Kakuhou Transplant Surgery on Kurona. They fought several times to prevent Kaneki from getting too close to the doctor. She referred to him as "big brother".

Madam A
Kurona used to work as her bodyguard to prevent her from being captured by Kaneki and his gang. When it became too much trouble, Kurona ditched her.

Powers and Abilities
Even before becoming a ghoul, Kurona was a promising candidate to becoming a CCG investigator which means that they had considerable strength and intelligence from an early age. After becoming an artificial one-eyed ghoul, Kurona has the heightened speed, strength, and regeneration capabilities of a ghoul.
 * Rinkaku Kagune: She gained her kagune from getting one of Rize's kakuhou implanted into her. Her kagune presumably has the same abnormal regeneration rate seen in Rize's. She is capable of creating up to 2 tentacles from her waist. Like all rinkaku types, she overpowers her opponents with brute strength. In addition, she mostly fights alongside with her twin sister and adds pressure to their enemies with their combination attacks, similar to the Bin Brothers. After the time skip, she can produce several more tentacles and shape them into claws, as well as blades, to suit her purposes. Kurona also has the ability to detach her kagune and use it as a makeshift sword, utilizing the quinque skills she acquired in the academy.
 * Rinkaku Kakuja: After merging with her sister Nashiro, Kurona was able to attain an incomplete kakuja. Her kakuja takes the form of two large arms attached to her shoulders with scaly armor platings covering her shoulders and chest. The arms can be extended to reach distant opponents. She can also release her normal kagune, creating several tentacles that are larger and longer than normal. Her kakuja forms a half mask that is covered with numerous eyes. In her kakuja form, she is able to handle Suzuya, a Special Class Investigator and two members of his squad without much difficulty. However, as an incomplete kakuja, Kurona loses all aspects of her personality. Regardless of her diminished mental state, she still remains a deadly opponent to contend with.
 * Superhuman Regeneration: During her fight against Juuzou Suzuya, Kurona displayed an abnormal way of healing and was able to easily reattach her upper body after being cut in half.

Trivia

 * In Tokyo Ghoul Trump, she's featured as the "Seven of Hearts" along with Nashiro Yasuhisa.
 * According to Professor Kanou, she's considered a floppy despite having no known defects.