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Lydia is a serious but kind girl who is sensitive beyond her Goth dress and feels isolated in the world. Her father and step-mother do not take anything she says seriously and often ignore her for their own selfish pursuits. Lydia loves writing poetry, taking photographs, and loves anything pertaining to the supernatural and paranormal. Despite her young age, Lydia appears to be the most sensible member of the Deetz household. By the end of the film, she is more happy and well-adjusted because Adam and Barbara Maitland become active parental figures alongside Charles and Delia Deetz, who take a stronger role in her upbringing after having seen her nearly forced into marriage with Betelgeuse.
- In the film she was portrayed by Winona Ryder. It is unknown if she will reprise her role in the game.
- She uses the new hairpiece used by Nya in The Lego Ninjago Movie.
- Her appearance at Saturn is likely a reference to her animated counterpart's ability to freely travel between both worlds of the living and dead.
- This is further supported by a nickname for Betelgeuse she uses in a restoration which originated from the show.