Claire Brewster is an antagonist and Lydia Deetz's arch-nemesis in the human world where Lydia lived. She is a snobby, snooty girl with a valley girl accent. Lydia hates her for mocking her and Beetlejuice hates her, too so he can pull a prank on her.
In "Laugh of the Party", she started her Halloween party and didn't invited Lydia, which Lydia have her own party, which excited Bertha and Prudence so they can come. The next day at Halloween, Claire is invited to Lydia's party, she is dressed as a homecoming queen and dances with the hairy Party Animal monster. She takes him with her to meet her parents, however, the Party Animal remove his head to scares them and Claire, they all run away in terror.