Warfarin is a vampire Sarkaz doctor and one of Rhodes Island's elite medical operators. Known as 'Doctor Fish' for her blood research expertise, she treats patients while satisfying her thirst for blood, often eyeing the Doctor's. Playful and teasing, she heads the medical department's blood studies. In Arknights: Endfield, she feels nostalgia for Gilberta's personality, suggesting similarities. A 5-star Medic with strong healing and debuff capabilities.