Leonardo da Vinci takes center stage in the comedic OVA *Fate/Grand Carnival*, tackling systemic tensions among Chaldea's Servants. She observes and intervenes to resolve frustrations fueled by perceived inequalities in deployment frequency and resource allocation, including lengthy mission wait times and neglected leveling. Her role focuses on crafting organizational solutions to maintain harmony within the resource-limited environment. Her characterization reflects core *Fate* franchise traits: she manifests as a female incarnation, adopting the *Mona Lisa*'s appearance as her ideal of beauty, embodying her lifelong pursuit of aesthetic perfection. She exhibits a rational yet eccentric personality, approaching problems with intellectual curiosity and calm pragmatism, even amidst absurdity. Her genius includes technical ingenuity, demonstrated by inventions like the Shadow Border armored vehicle, echoing Leonardo's historical tank designs. Within the Carnival's narrative, she engages in historical and artistic references. One storyline features Michelangelo, whom she acknowledges as a peer in artistic genius despite their historical rivalry. This dynamic sees playful friction, though their interaction escalates into combat due to spectral circumstances. Similarly, her former assistant Salaì appears as a ghost tied to unresolved personal history. The OVA also parodies her artworks, featuring *The Scholars of Chaldea*, a pastiche of Raphael's *The School of Athens*, depicting her collaborative work with Dr. Romani Archaman. Her technical expertise remains pivotal, supporting the protagonist through gadgeteering and tactical advice. This involves creating vehicles and devices tailored to singularities, often incorporating avian motifs reflecting her fondness for birds. Her problem-solving extends to administrative challenges like optimizing resource distribution among Servants. The Carnival's episodic format amplifies her humorous traits, including unabashed eccentricity and occasional obliviousness to social norms. These elements contrast with her intellectual authority for comedic effect. Her position as Chaldea's "Special Honorary Advisor" casts her as both a stabilizing force and a catalyst for resolving Servant grievances through structured initiatives.