Olivia vel Vine ranks among the Demon Lord's Four Heavenly Kings, wielding significant authority. Her appearance features distinct beastwoman traits: waist-length jet-black hair, cat ears, a tail, and translucent lily-white skin. She stands approximately as tall as Ard Meteor, making her a taller woman. Her personality exhibits complex duality. Externally, she maintains a calm, expressionless facade and acts as a prudent, merciless tactician. However, those who know her across millennia, like Ard, witness contrasting behavior: sour moods make her unusually talkative and peppy, while happiness renders her tight-lipped and prone to childish pranks. Her cat ears and tail reliably betray her unspoken emotions and thoughts. Olivia shares millennia of history with the original Demon Lord Varvatos, serving alongside him for over 3,000 years as an older sister figure. After his reincarnation, she searched for him for a thousand years, eventually finding him as Ard Meteor. His familiar mannerisms and overwhelming magical power, despite concealment attempts, immediately made her suspect his true origin. Her relationship with Ard blends harshness and kindness, reflecting their long dynamic. She enforces boundaries between them, though often reluctantly, and shows capacity for self-reflection about these actions. Her composure falters primarily in two situations: encounters with extreme innocence or naïveté, such as Ireena Litz de Olhyde, and exposure to sweet potatoes. The latter triggers an almost childlike obsession, stemming from Varvatos eating them in the past—a minor grudge fueling her initial desire to punish him. Professionally, Olivia serves as a special instructor at the magic academy, rigorously assessing students. Her tactical expertise and strategic mind remain sharp, consistent with her reputation as a shrewd commander. Her status as a Heavenly King implies formidable magical and leadership prowess.