Luna first mentioned the Blibbering Humdinger in Harry's Fifth year to Lavender Brown and Parvati Patil who were laughing at her earrings. At the end of the Second Wizarding War, in order to give Harry some peace, she distracted everyone in the Great Hall by pretending to see one of these creatures.
- Harry Potter and the Order of the Phoenix (First mentioned)
- Harry Potter and the Half-Blood Prince (video game) (Mentioned only)
- Harry Potter and the Deathly Hallows (Mentioned only)