The DA misinterprets ancient Japanese wisdom, Trelawney is a competent professor, and Dobby thinks he's a mad scientist. Where did it all go so wrong? Find out, in THE MIGHTY FIST OF HEAVEN. (Dumbledore's Army; AU, Order of the Phoenix and onward.)
Things are looking bad for the Death Eaters when Hermione immerses herself in dark forces which mankind was never meant to know—like compound interest and quarterly tax returns. Mainly Goblet of Fire. One-shot.
Living in a time loop causes Harry Potter to reflect on the nature of screwing (up or otherwise). One-shot.
In which Light's notebook deals something other than death and apples aren't the only thing to be consumed. On hiatus, but not forgotten.
The Last Game played with Death was called Life, and when the end didn't matter, all that could be valued was how he played the game...