*EVE is straightforward and blunt, as fitting for a soldier. She also seems to have a dry sense of humor and sarcasm. However, EVE is shown to have a compassionate side towards characters like Kaya, whom she aids in the search of her sister despite her doubts about the latter's survival. EVE also has a curious and even somewhat dorky aspect to her character, showing great interest in things from the old world on Earth like books, maps, and the cans that she adds to her collection as a special interest.

During EVE's time in Xion, she would willingly help the people without incentive. After seeing the memories of the humans who died and noting Xion's negative opinion on the Colony, EVE believed she and Lily should help the people to show otherwise. Stating that if they are to help humanity, they should be an example towards them.

During her mission, upon discovering the Legacies left behind by Raven, EVE became shocked at the truth that she and all others from the Colony are not even humans, alongside the Naytibas' true origins as descendants of mankind. While EVE seemingly moves on and focuses on the mission, over time she seems to accept this truth as she discovers more evidence and Orcal giving his recount of the past. By the time she faces Raven for the final confrontation, the latter mocks that by this point, EVE believes she isn't human at all. Even still, she continues in fighting the Naytibas due to the dangers they represent while still helping the people of Xion.

EVE also possesses a rare, ruthless side to her. Upon being forced to kill Tachy, along with discovering that Raven was the cause of Xion's burning, during their final fight, she would order Lily not to get involved in her battle with Raven as it had become personal, and would cut off her arms and damage her exospine, paralyzing her to ensure she could no longer fight, a helpless state in which EVE would leave Raven in to watch the end, despite the latter pleading for EVE to kill her.

EVE is a beautiful woman with a slender figure, brown eyes, black hair tied in a long ponytail, and bangs. She has various small moles across her body and face. Her default outfit, the Planet Diving Suit (7th) Nano suit is a green skin-tight bodysuit with a metallic sheen, a green tie, white gloves, and opaque cape-like extensions on the back of her suit. She also wears different types of heels depending on the outfit the player chooses. Her sword Blood Edge folds up and functions as a hair clip for her ponytail when not in use.

Customization is a feature with options being; hairstyles, hair color, earrings, glasses and Nano suits.

Upon triggering Tachy Mode, EVE dons Tachy’s Nano suit, wields her Tachyon Blade, and a single metallic wing will sprout on her left shoulder.

After fusing with Adam to become the first of a new species, her appearance undergoes a transformation similar to that of her Tachy Mode, granting her a white halo on her head, a white Nano suit, a shining golden blade (called the Blade of Legacy in the digital artbook), and a large, white-feathered wing sprouting from her left shoulder with a pair of smaller wings on the small of her back, giving her the appearance of an actual angel. By equipping the Symbol of Legacy earrings, which were released as part of Update 1.009, EVE will transform into this “Fusion State” when entering Tachy Mode.*