Eureka is an adolescent girl with vivid green hair and violet eyes who serves as the pilot for Nirvash typeZERO. She treats her mechanical companion not merely as machinery but as a sentient being possessing consciousness and emotions. Despite this, she may come across as aloof or inarticulate to others due to difficulties expressing herself emotionally and comprehending human feelings. Occasionally, Eureka materializes unexpectedly beside individuals, startling them at times. Initially in the series, she experiences frequent headaches which seem linked to Renton Thurston's presence. As a mother figure, Eureka is responsible for nurturing Maurice, Maeter, and Linck but frequently questions her role as a caregiver, seeking guidance from Renton on how to discipline them effectively and whether she is an adequate mother.
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.After sh
She is Aos mother.
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.After she is revealed as a Coralian, Renton does not reject her as she feared but rather accepts her for who she is, not what she is, which results in a further expansion of her understanding of human emotions.