It's no small thing to save a life, but losing one can shape you beyond imagining. The day Obito had his first brush with death was the day another part of Obito woke up. And What should have been, took three steps to the left. In typical Potter fashion. Harry Potter made a decision and Uchiha Obito has to live with it, whether he likes it or not.

Newt/Harry, Timetravel Shenanigans, Canon Divergent. His plan was to avoid changing the timeline. He knew he wouldn't be able to resist if the opportunity presented itself. So he fled to Africa, where opportunity found him instead.

After the detection of a paradox within the space-time continuum, the White Guardian sends the Second and Tenth Doctors on a mission to secure the existence of the Brigadier. But this will have its own consequence... Dr Who/Dune Crossover