Gilderoy Lockhart was the owner of a peacock quill and he used it to sign his autographs. The flamboyant nature of Lockhart matched that of the quill. Ron Weasley looked utterly revolted upon seeing the quill, but Lockhart completely misinterpreted it as admiration. The quill was battered by the time Lockhart was admitted to St Mungo's Hospital for Magical Maladies and Injuries. Despite losing his memories of his ill-gotten fame, he continued to use the quill to sign autographs, without knowing exactly why.
- Harry Potter and the Chamber of Secrets (First appearance)
- Harry Potter and the Order of the Phoenix