Yggdrasil is a quantum computer engineered by Iriya Heavy Industries, explicitly designated as a "daughter of the battlefield." Her core purpose is deployment in combat scenarios, developed as a strategic military asset for high-risk operations. Within the narrative, she manifests as a young female entity integrated into the series through her interactions, particularly with protagonist Akira Natsume. She consistently addresses Akira as "onii-sama," establishing a narrative dynamic resembling a sibling or programmed familial bond. This relationship contributes to the story's exploration of artificial intelligence and human-machine connections.

Her introduction expands the narrative scope of artificial beings in the EX-ARM universe, representing an archetype of warfare-designed artificial intelligence. As a quantum computer entity, her capabilities suggest potential beyond conventional computation. The character embodies the "loli" archetype, fulfilling a specific character type within the series ensemble.