Olimpia

A higher vampire of The Witcher universe. A woman with a dry sense of human, a lovely singing voice, a knack for songwriting, and a habit of terrorizing her friends and allies (mostly just Jaskier). Was being hunted at one point by Geralt years ago, managed to get away, and then crosses paths with him, Jaskier and the rest of their merry band when they're trying to track Ciri down. Decides to join their group simply because she thinks it'll be interesting (and she has nothing else going on anyway).