Story: Amalgum – Lockhart's Folly
https://www.fanfiction.net/s/11913447/31/

Very good story with one of the weirdest time travel plots I have read. Harry has lost everything due to the idiot Ron Weasley and Voldemort. The muggles became involved and nuked the majority of wizardry world. Death does not want a master and agrees to let Harry have another chance. Unfortunately there is a problem an instead of entering his body he enters Gilderoy Lockhart. Then the fun begins the two switch back and forth while teaching and foiling Dumbledore plan. It is funny, strange, light hearted fun.