Luvelia Sanctos is a central character in the comedy series Peter Grill and the Philosopher's Time, including its second season Super Extra. She is the daughter of Alistair Sanctos, the master of the Brave Swordsmen's Guild, and the long-time fiancée of the protagonist Peter Grill. Luvelia has very long black hair and blue eyes, and she commonly wears a cape and a hairband. Despite her outward appearance as an ideal knight, she has been raised in an extremely sheltered manner by her overprotective father, resulting in a childlike and innocent understanding of the world. She is notably unaware of Peter's numerous romantic entanglements with women of other races, and she holds the misconception that babies are delivered by storks.

Her personality is characterized by naivety, genuine kindness, and a strong sense of devotion. She is curious about the world around her and sometimes takes proactive actions that surprise others, though her limited knowledge often leads to humorous misunderstandings. Luvelia's primary motivation is to marry Peter Grill and start a family, believing that this is the natural next step in their relationship. She is also determined to carry on the family name, a goal she discusses openly with Peter.

In the story, Luvelia serves as Peter's primary love interest and the emotional anchor of the series. She is unaware of the harem of women pursuing Peter, including the ogre Lisa Alpacas and the elf Menma, which creates much of the comedic tension as Peter desperately tries to keep his affairs secret. Her role in the guild is largely administrative; she assists with clerical tasks and helps manage guild affairs, though she avoids fieldwork due to her sheltered upbringing. She is not portrayed as a combatant despite being a guild member, and her combat abilities are not emphasized.

Her key relationships include her fiancé Peter Grill, to whom she remains unconditionally devoted, and her father Alistair, who is overprotective and initially reluctant to approve the marriage. Luvelia is friendly with other female adventurers but never suspects their true intentions toward Peter. Throughout the series, including Super Extra, she shows little character development, maintaining her innocent and trusting nature. This consistency reinforces her role as a comedic foil and highlights the contrast between her idealized view of her relationship and the chaotic reality Peter navigates. Her notable abilities are limited to her competence in guild administration, her unwavering loyalty, and her capacity to remain cheerful and optimistic despite her limited worldview.