Harry Potter learned several valuable lessons in Night Vale that had previously escaped him. The first, and probably most important, was how to pick the battles he fought rather than charge head-first into every potential problem that cropped up. There was so much fear and terror in this tiny town that the wizard had run himself ragged within a week before realizing he simply couldn't continue on the way he had for the previous four years. He had literally been forced to prioritize.
With that new skill came the second lesson, and that was to take care of himself first. It sounded cold, especially to a reckless Gryffindor like him, but if he couldn't look after himself, he wouldn't be able to help anyone else, either.
The final lesson was not 'the ends justify the means,' so much as simply, 'focus on the results, rather than your feelings in the present.' In other words, Harry's inner Slytherin finally had a chance to shine.
By the time he was forcefully entered in the Summer Reading Program, he knew enough to keep his head down, barrel through, and do what he needed to do in order to survive. He also resolved that none of the people at home, especially Hermione, would never know what had happened in there. (The librarians were not human. They looked human, but they were not human. The things they'd had to do in order to escape. . . *shiver*.)
That was how Harry got involved in the War for Night Vale. He became one of Tamika Flynn's protégés. He didn't know how to feel about that. On one hand, he was glad that someone had finally decided to train him to fight (because it was obvious he would need to fight Voldemort and his followers eventually). On the other, no one here was going to use magic here, and he was apparently going to fight for a city that he hadn't even known about until, like, a month ago.
