Provat Pecora Allières rules as the Demon King of the Demon Kingdom while simultaneously pursuing a successful career as a popular idol. She possesses the appearance of a young girl with short light blonde hair resting above her shoulders, green eyes, and distinctive curved ram horns. Despite this childlike form, she initially presents a sizable bust, later revealed as an illusion stemming from insecurity about her small stature compared to others, including Azusa. Her signature attire is a distinctive black, backless, shoulderless dress trimmed with white fur at the hem, connected by a fur choker at her neck, and complemented by black fur-trimmed gloves.

Outwardly projecting purity and innocence, Pecora's core personality is fundamentally mischievous. She delights in teasing others, adopting a particularly manipulative and playful demeanor around Azusa or family members, often causing frustration. This contrasts sharply with the mature persona she maintains in her official role as Demon King. Her interactions with Azusa are complex; she frames her attachment as "sisterly love" while repeatedly implying deeper romantic interest, explicitly referring to an outing as a "date" when inviting Azusa to an art exhibition.

Pecora’s background remains largely undefined, established only as holding the position of Demon King for most of her life alongside her idol activities. Significant plot points involve her intentionally withholding crucial information from Azusa, leading to conflict. Notably, she fails to explain the cultural significance of touching the dragon Flatorte’s horn, resulting in Azusa’s accidental de-aging and subsequent arduous journey for mandrake-based medicine. This incident marks one of two known occasions where her actions provoke Azusa’s anger.

Her name incorporates multiple references to sheep: "Provat" closely resembles "Provato" (Greek for sheep), "Pecora" translates to sheep in Italian, and "Allières" is pronounced similarly to "Aries," the zodiac sign representing the ram.