Eve emerged as the inaugural EL-Diver in Gunpla Battle Nexus Online (GBN), uniquely sensing and interpreting the emotions of Gunpla models, a trait shared with her sister Sarah. She encountered Hiroto Kuga during his initial GBN explorations, forging a bond that became his most cherished memory. Eve diagnosed a malfunction in Hiroto’s Core Gundam by perceiving plastic fragments obstructing the backpack thruster as the Gunpla’s "pain," resolving the issue. She further nurtured his creativity by affirming his pursuit of small-build limits, directly inspiring his "Planets System" armor sets and their cosmic naming theme. Hiroto gifted her a distinctive green-gem earring as a token of affection and gratitude.

Following Sarah’s emergence, black Sarah-formed bugs manifested in GBN. Eve covertly absorbed these anomalies, enduring excruciating pain that distorted her into a colossal system-threatening entity. To preserve GBN’s stability and Sarah’s survival, she implored Hiroto to delete her. This sacrifice alleviated critical system strain, enabling the original Build Divers to resolve the crisis and allowing administrators to implement fixes that facilitated future EL-Divers.

Years later, during the Second Coalition of Volunteers battle, Hiroto refrained from shooting Riku’s approaching Gundam 00 Sky—intended to reach Sarah—recalling Eve’s final plea to aid other EL-Divers. His deliberate miss enabled Sarah’s rescue. Residual data from Eve contributed to the creation of another EL-Diver, May, who bore an identical pendant to Eve’s earring, implying a direct link. An Ancient being depicted in Eldora’s flashbacks resembled an older, black-haired Eve and shared her voice, suggesting deeper ties to Eldora’s history. Eve’s physical design notably echoed Dianna Soreil and Kihel Heim from *Turn A Gundam*.