There's MarySue!Harry Potter... There's Dark!Harry Potter... And there's Powerful!Harry Potter... But let's take it a step further. This is SUPERMAN!Harry Potter. A cynic's version of Harry Potter fanfiction.
Harry walked right over to the Dark Lord’s throne and sat down, folding his legs as the Death Eaters all simultaneously moved over in front of him and bowed down to their new Lord. "Hail to the King, baby." Time-Travel, Dark-fic.
The revival of Voldemort has brought Dumbledore to a drastic option. Harry Potter, welcome to Beauxbatons.