Lydia is a Mynci in the Book Lupe Mysteries who is friends with Fantos the Grarrl and Beerfil the Meerca. She enjoys riding her bike, and was briefly a suspect in the theft of Fantos's bike, before Inspector Barik Von Lupe figured out Beerfil was the culprit.
Have you solved any good cases lately?
As Lydia only appears in a Neopian book, it is unclear if she is a character in the real Neopia.