Been disappointed by some particular TV shows with unsatisfying endings, botched/thrown away character development, and non-existent chemistry within the cast. Any book series that is the opposite?

Hi! Any book series that you would recommend that has a good ending, satisfying character development, and good interactions among the main characters. I know it's a big ask, but none of the traits above have to be perfect. If you, as a reader, felt satisfied with the book regarding the above traits, please do [...]