6. Gilderoy Lockheart:

He was certainly the weakest of all the Defense Against the Dark Arts professors. Some of his moments of incompetence come when Lockhart tries to fix Harry's broken arm and ends up removing the bone entirely.
He attempts to instruct his class about Cornish Pixies and releases an untamed chaos. His only real power is memory charms, which he uses to buff up his own glossy image, and even those spells rebound on him in the end.
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Edited by Yesha Srivastava