Kaori Nazuka (Japanese), Stephanie Sheh (English)
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is a pale young girl with turquoise hair and lavender eyes and is a pilot of the Nirvash typeZERO. She treats Nirvash not like a mere machine, but as a living being, with consciousness and feelings. However, she can seem distant and awkward to other people - she has trouble communicating with other humans and understanding their feelings. She tends to appear randomly next to people, startling them at times. Initially in the anime, she suffers from frequent headaches; these stop later on, seemingly due to the presence of Renton Thurston.
It is later revealed that she is actually a Coralian in human form, sent by the sentient Scub Coral to understand and communicate with humans. The Scub Coral, who had become the largest living mass on Earth, longed to connect with humanity, and created two human form Coralians to reach this goal. Sakuya came first, and she foretold of Eureka's arrival. Eureka was meant to be a blank slate, so that she would be shaped by her experiences with humanity, and bring these experiences to the Coralians. She herself is not aware of her past nor does she have any knowledge of the Coralians even though she's one herself. She is the adoptive mother of Maurice, Maeter and Linck, whose families she killed while in the SOF. Her lack of understanding of her own feelings and the methods by which humans demonstrate and share feelings creates many complications at times whenever Renton tries to bond with her. After she entered the Coralian with Renton, she began to suffer at a subconscious level as a side effect of her proximity to the old dig site FAC51, and the large amount of Scub within. She becomes constantly fatigued and seems to be in either despair or depression. Her negative feelings are further increased as she becomes convinced that the Nirvash no longer wants her as its pilot in favor of Renton. She tries to make things up with Renton, but is rebuffed.
As an attempt to deny the emotional changes in herself and her relationship with the Nirvash, she tries to return things to the way they were when she met Renton, and removes Renton's Compac drive from the Nirvash. She falls asleep and the Nirvash, operating on its own, drives her deep into the mine to the face of the Scub. She is seemingly compelled to walk into the rockface, where the Scub reaches out and engulfs her. Renton becomes worried and rushes out to find her. From her point of view, she feels that she is melting away and wishes to be rescued. Just as she is about to melt, Renton is perceived to catch her in his hand. He pulls her out of the rockface and causes another trapar event in the process of using the Nirvash to return her to the Gekko.
As an indirect result of this incident and Holland's apparent lack of urgency about helping her, Renton runs away from the Gekko. She is still very weak, and the crew conspires to prevent her from discovering that he is gone, especially as she seems to be becoming interested in him. After she discovers this, she confronts Holland who basically states that Eureka is more important than Renton, which she denies. She dresses in the clothes given to him for the Ramen prank, and begins to do the jobs that had been assigned to him, "because he is not here". As she begins to confront Renton's importance to her, Mischa informs Holland that the Nirvash needs Eureka and Renton to function properly.