Agreed about the list of older fairy tale characters but I can’t see Blue hating magic – dark magic sure but would she give the order to wipe out all of SB including her friends?
Her magic supposedly comes from a good place and grants the deepest desires of good people. Not sure I can see that happening even though she does come across as shifty sometimes. I think we just need Blue Fairy backstory to clear all of that up. They must be holding it for something good / important that relates to a present day thing we just haven’t gotten to yet. Perhaps relating to the book.