Varda functions as a dedicated analytical entity within the Necrodiver system, emerging as a data construct from the realm of the dead. Her core purpose involves environmental and enemy assessment to support Shu Aiba. She manifests with distinct physical traits: purple hair, purple eyes, detached sleeves on her attire, head wings, and bracelets.

Initially defined by strict logic and emotional detachment, she routinely labels Shu a "failure" when his protective actions toward allies like Noa Rukina and Iera Hamon compromise tactical efficiency. Despite this critical stance, her loyalty to Shu remains unwavering across all conflicts.

Her development reveals a gradual emergence of compassion and loyalty beyond her programming. Interactions with Shu, Noa, and Iera spark this evolution, leading to subtle protective instincts and camaraderie. This culminates in her explicit acknowledgment of friendship, marking a shift toward human-like emotional responses. Fellow servants Vaire and Varal occasionally contrast her earlier analytical rigidity with her growing grasp of human connections.

In combat, Varda provides defense through Shog Shield energy fields. Her analytical role proves strategically vital against Hadean entities and transformed adversaries like Shu’s former squad mates. She participates in the Orb R'lyeh fusion technique, merging with Vaire and Valar into a pyramid-shaped energy construct with tendrils. Her function intertwines with sacred artifacts, including the Mirror of Geld, which enables servant materialization and proves pivotal in defeating antagonist Rei during the climax.

Her involvement spans major arcs: acquiring Abhoth’s Bones, defending rebel bases, and confronting the Book of the Dead’s manifestations. Her transition from detached analyst to invested ally persists consistently through all official storyline continuations.