Gilderoy Lockhart was the best villain in Harry Potter, much better than the Noseless Lord or any of his lame followers. And it really sucks that everyone - people in-universe, JKR herself, and most of the fanbase - treats him like a joke. In the right hads, the concept of of someone who mass-mindrapes people in order to build a fake heroic reputation all while behaving like an asshole micro-celebrity of a type that typically ends up cancelled for unappropriately interacting with a minor, could have been a potentially TERRIFYING. Instead, he ended up in the hands of JKR, who made him into a joke character that stopped being funny mid-way though the book.