Goody Two Shoes (appeared in her own episode in BJ's animated series) is an annoying fairy who works for the Bureau of Sweetness and Prissiness (BS&P for short and it's not what you think). She's in her own episode, called Good Neighbor Day, to break up a fight caused by Beetlejuice. Goody Two Shoes is in charge of enforcing the rules for Good Neighbor Day.
She's an extremely powerful fairy and one of the few beings in the Neitherworld more powerful than Beetlejuice since all his spells and tricks don't work on her. In the end Lydia and Beetlejuice figured out how to get rid of her by tricking Goody into getting in trouble with her home office.