one of the series i read as a kid and that stuck with me the most despite never fully finishing it was the edge chronicles. not only did it have a really cool world where rocks were splitting off of the edge and floating up in the sky (they had to be chained down and buildings would be built on the larger ones) but it also had the most important thing in the world to younger me:

sky pirates.

which was something i always wanted to do something with writing wise but never did

also there was a moment in the books where one of the characters was wandering around the twilight woods which caused you to loose your memory and sense of self, but never your life and he found the decrepit body of a man from ages before and the man tried to go after him and that moment haunted me ever since