nearly complicated the plot of the Harry Potter story beyond salvaging. The writers of "Back to the Future II" left Marty's girlfriend Jennifer unconscious for most of the movie because figuring out what to do with her timeline was just too complicated. When the MCU introduced time travel in Endgame, they did it in such a way that requires internet video breakdowns to grasp (or you can simply hand-wave it, like this guy). Regardless of what type of time travel you introduce into your fictional universe, you have to be ready to deal with the fallout. And that fallout is going to include internet bros saying you did it wrong. So what better character to provide the perspective for a time-travel story than a magical, chaotic, selfish being who manipulates every situation toward his own ends?