Personality
Eto has a cruel nature, frequently displaying happiness at the expense of others' pain. She has no qualms about slaying humans and ghouls without remorse, and she revels in inflicting agony on others. Eto, like her mother, has a keen sense of people's sentiments and desires, which she uses to her advantage while interacting with her victims and persuading others to do her bidding. Her warped personality is likely the result of her struggle to keep alive in the 24th ward during her early years.
She is able to compartmentalize her ghoul and human alter egos with relative ease, as can many ghouls. She is rather fun and scatterbrained as Sen Takatsuki, oversleeping on the day she was meant to be signing books and taking photos with fans although her management forbade her from doing so.
The author, according to the profile Haise Sasaki develops based on his examination of her works, is a woman filled with despair and loathing for the world, who has long since given up hope. While this is mainly accurate, she is passionate about building a society where ghouls are not persecuted for their existence and will go to any length to achieve this goal, regardless of the cost.
Appearance
Eto is a petite woman in her twenties who has a sleepy or interested expression on her face. Her long green hair is frequently disheveled or in a bun on top of her head, which matches her modest or sloppy style. Though her hair is normally disheveled, she is known to be an extraordinary beauty with many admirers and bears a striking likeness to her mother, Ukina; this resemblance is heightened when she cuts her hair into a short bob later in life.
She wraps her entire body in bandages while in Aogiri, which also serves as a disguise to keep her identity hidden. She wears a flowered scarf around her neck and a maroon hooded robe with droopy ears over it. Her right eye is a kakugan, and her left eye has a bright green tone.
History
As a hybrid being, Eto was born to Ukina and Yoshimura. They compelled Yoshimura to kill his lover as a punishment for "betraying" them since her mother had been discreetly studying the organization V. Yoshimura gave his young daughter to a ghoul known as Noroi in the 24th ward with her mother's diary in order to safeguard her. What happened in the next decade or so is unknown, but she would emerge from the 24th ward as a kakuja and go on a violent rampage.
A crew led by Itsuki Marude discovered Eto deep within the 24th ward during a normal Whack-a-mole operation and was immediately overrun. Kasuka Mado, an Associate Special Class, stayed behind to let the others flee, risking her life to defend her husband Kureo Mado and their colleagues. Eto had cut the investigator to pieces and spread her partially-devoured parts all over the place for them to locate, according to a later investigation. Kureo Mado retaliated by embarking on a vengeance quest that would eventually engulf him.
Eto made his debut appearance one day and killed a Special Class Investigator linked with the 3rd Ward by himself. She was given the nickname "X" and awarded an S-rating.
Eto carried out a large-scale attack against the CCG's 2nd Ward Branch Office a month later. The CCG sustained multiple casualties as a result of the heavy damage to the building. Because of her kagune's owl-like plumage, Eto's rating was raised to SS and her moniker was renamed "Owl." Eto's nickname was altered to "One-Eyed Owl" after a report that she only had one kakugan.
The S3 Squad, led by Special Class Mikito Urie, confronted Eto during her multiple attacks. To secure his soldiers' life, he ordered a retreat and perished battling her alone. Iwao Kuroiwa and the other survivors later informed a young Kuki Urie, who vowed to punish his father one day.
Eto's group then launched a second attack on the 2nd ward. With his quinque, First Class Investigator Kuroiwa caused significant damage to Eto's kakuhou. Kuroiwa, on the other hand, was gravely hurt and was unable to participate in further operations. Following that, Yoshimura, acting alone in his daughter's place, attacked the 2nd ward for the third time in order to divert the CCG and V's attention away from the 2nd ward.