Olivia vel Vine ranks among the formidable Four Heavenly Kings of the Demon Lord's Army, commanding significant authority. Her appearance features distinct beast-woman traits: waist-length jet-black hair, prominent cat ears, a tail, and translucent lily-white skin, standing roughly as tall as Ard Meteor. Her personality exhibits a striking duality. Outwardly, she maintains the calm, expressionless demeanor expected of her station, showing enemies no mercy and employing shrewd tactics. Yet closer acquaintance reveals her true emotional state through her cat ears and tail. Sour moods trigger excessive chatter, while happiness inspires childish pranks and unusual silence. She harbors a particular fixation on sweet potatoes, evoking childlike enthusiasm that once drove her to consider punishing the Demon Lord for eating them. Historically, Olivia served as the adopted older sister figure to Demon Lord Varvatos. Following his self-inflicted death from isolation, she spent over 3,000 years relentlessly searching for his reincarnation. She now acts as a special instructor at the magic academy, rigorously assessing students. Upon encountering Ard Meteor and witnessing his display of limitless magical power, she immediately suspects he is Varvatos reborn. Her relationship with Ard reflects deep conflict. She historically treated him with harshness devoid of overt affection, masking genuine respect and love. This severe yet underlying kindness continues after his reincarnation. Olivia demonstrates capacity for self-reflection, acknowledging past mistakes like creating unnecessary distance from Ard. While typically composed, she displays vulnerability when confronted with extreme innocence or naïveté, as seen with Ireena Litz de Olhyde. Her status as a Heavenly King implies significant combat and strategic prowess, though specific capabilities remain undefined in available sources. Her birth date is officially recorded as March 27.