Eto has a sadistic personality, often expressing joy at the expense of others' suffering. She has no qualms about remorselessly slaughtering humans and ghouls alike, and shows happiness when inflicting pain on others, Eto has a very sharp intuition about the feelings and desires of people, which she exploits to the fullest when dealing with her victims and manipulating others to do her bidding. Eto twisted personality is possibly the result of fighting to stay alive during her early years. Like many ghouls, Eto is able to compartmentalize her ghoul and human alter egos with relative ease. As Sen Takatsuki, she is quite playful and scatterbrained at times, oversleeping on the day she was supposed to be signing books and taking photos with admirers when it was prohibited by her manager, she is also shy and loving with User, tying as much as possible to hide her ghoul self.
Eto is a petite woman in her mid-twenties with a typically sleepy or curious expression. Her long green hair is usually messy or on top of her head in a bun, complementing her modest or sloppy fashion. Though she is typically unkempt, she is noted to be an incredible beauty with many admirers. Eto, while active in Aogiri, she wraps her entire body in bandages, doubling as a concealment to keep her identity secretive. Over it Eto wears a maroon hooded cloak with droopy ears and a floral scarf around her neck. Eto right eye is a kakugan, while the other eye is a tone of light green, she hides her kakugan with contact lenses has she spend times with humans.