The only part that'd make sense in a Harry/Fleur fanfiction is one I may end up writing and posting. Harry is raised by muggles, and muggles have a tendency to gain disorders because of abuse. When Harry fails to realize he's different than the rest, he also gains a mental disorder. A personality disorder which allows him the immunity to any and all types of mind altering spells, like a Veela's allure or a potions professor's legillimens, or dumbledore's mental manipulation. With Harry's mind split in five pieces, and four aptly naming themselves after the founders of Hogwarts, what can anyone really do? Many people gain a thing called curiosity, but it's the highly persistent who refuse to give up. Way to go, Godric. You just had to save a little girl from a lake!