Rosetti is portrayed as a kind and outgoing young woman with a warm and affectionate nature. She often expresses her friendliness through physical gestures, such as clinging to Kufa Vampir’s arm in Episode 4: Two Young Ladies Assemble at the Chained Castle, even when he protested. Her approachability and cheerfulness stand in contrast to the more reserved and pragmatic individuals around her.

Despite her reputation as a prodigy and member of the Crest Legion, Rosetti remains humble, frequently downplaying her accomplishments and insisting that others exaggerate her fame. Alongside her caring personality, she also displays a playful side; in Episode 6: The Gray Witch, she and Kufa conspired to prank students from both St. d’Autriche Girls Academy and St. Friedeswiedes Academy during the unofficial closing party, showcasing her mischievous streak.

Rosetti is depicted as a young woman with shoulder-length hair of a consecrate hue, styled with a side ponytail that falls near her shoulder and is fastened with a white bow. Her eyes are distinctive, with a gradient that shifts from tan at the bottom to tosca at the top.

Her attire is notably vibrant, consisting primarily of shades of pink, accented with white and light blue. She wears a ruffled dark pink top with lighter pink across the torso, which leaves her midriff exposed. This is paired with a light pink and blue skirt, light pink stockings, and high-heeled boots in varying shades of pink, creating a cheerful and lively appearance that complements her personality.

Rosetti was born outside the city of Flandore into a family of farmers. Her life changed dramatically at a young age when she unexpectedly awakened the ability to manifest mana, an event that elevated her family’s standing from commoners to nobility.

During her youth, Rosetti distinguished herself as a prodigy by becoming the first individual in history to win a team-based tournament single-handedly, defeating all opponents without the aid of allies. This achievement brought her widespread recognition and established her reputation as an extraordinary talent.

Following this accomplishment, she was recruited into the Sacred Guards, where she became the youngest member in the organization’s history, further solidifying her status as an elite figure within noble society.

Rosetti’s primary weapons are a pair of chakrams, each adorned with golden floral designs. The inner grip area of the weapons is colored dark pink, allowing her to wield them with both precision and style. These chakrams reflect both her combat skill and her distinctive aesthetic, complementing her vibrant personality and appearance.

Elise Angel
Rosetti serves as Elise’s tutor at St. Friedeswiedes Academy and develops a close bond with her. Though their relationship is mostly seen within the school setting, Rosetti is protective of Elise in times of danger, as demonstrated when she defended her during the kidnapping by Williams Gin. Even when placed under Naqua’s control during her rampage, Rosetti resisted his command to drink Elise’s blood, reflecting her loyalty and care toward her pupil.

Kufa Vampir
Rosetti regards Kufa as both a colleague and friend, though their dynamic is layered with rivalry and hidden history. While Kufa values her as a fellow tutor, he has expressed concern that her lighthearted personality might negatively influence Melida’s training. In truth, the two are revealed to be adoptive siblings; during their youth, Kufa saved Rosetti’s life by turning her into his vampire kin but erased her memories so she could live a normal life “under the light.” Although Rosetti is unaware of this bond, her affection for him grows after their reunion, leading to jealousy toward Melida, whom she sometimes perceives as a romantic rival.

Melida Angel
Rosetti greets Melida warmly when they first meet, encouraging her to disregard her fame and simply call her “Rose.” Despite this kindness, Rosetti occasionally feels envious of Melida’s closeness with Kufa, particularly when reminded of their moments of intimacy. Unknown to Rosetti, Melida is aware of her secret as Kufa’s vampire kin but honors her promise to him by keeping it hidden.

Marquis Blossom Pricket
Rosetti was raised as the daughter of Marquis Blossom Pricket, introduced in Episode 7 of the anime and Volume 5 of the light novel. However, it is later revealed that she is not his biological child but was adopted after the death of her parents.