Leysritt is a homunculus created by the Einzbern family to serve as a maid, bodyguard, and caregiver for Illyasviel von Einzbern. Despite her adult appearance, she is only about two years old and was designed with a limited sense of self, yet she developed a degree of reason and loyalty through her bond with Illya. She has short white hair, deep crimson eyes, and a physically imposing build, and she typically wears a maid uniform. Leysritt shares the Einzbern household with her fellow homunculus maid Sella, and together they look after Illya and her adoptive brother Shirou Emiya while their parents Irisviel and Kiritsugu are away. Her personality is relaxed and somewhat detached, often displaying a quiet, almost emotionless demeanor, though she occasionally shows a playful side and an appreciation for anime. Her motivations are straightforward: she exists to protect and serve Illya, and she carries out her duties without question or personal ambition.

In the story of Fate/kaleid liner Prisma Illya 2wei!, Leysritt functions primarily as a supporting character who provides comic relief and domestic stability, but she also proves herself a capable combatant when needed. She is highly skilled in combat, particularly with halberds, and her physical strength is comparable to that of a Servant, notably matching Rider, the strongest female Servant in terms of raw power. Beyond her martial abilities, Leysritt can sacrifice her life to manifest the Dress of Heaven, a legendary Einzbern artifact that grants limited applications of true magic, allowing miracles beyond modern sorcery. This ability is used only as a last resort due to its fatal cost.

Leysritt’s key relationships include her bond with Illya, whom she treats with quiet devotion, and her partnership with Sella, with whom she shares a taciturn but cooperative dynamic. She also interacts with other characters in the household, such as Shirou, but remains largely in the background compared to the main magical girl cast. Her development is minimal across the series; she remains a steady, unchanging presence defined by her loyalty and her role as Illya’s protector. Her combat prowess and the latent danger of her Dress of Heaven ability mark her as more than just a maid, though she rarely takes center stage. Overall, Leysritt is a calm, powerful homunculus who serves as a reliable guardian and caretaker within the Einzbern family.