I always thought that every story was real in some shape or form in the Once universe. Even if Harry Potter never gets shown or mentioned in the show, in my mind it still exist as one of many realms they can acces. Now when it comes down to that Twilight Saga >>
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC