Writing a story with a large cast of characters can be tricky. My books tend to have a large cast, and with each progression in the series, the cast gets bigger.
Book three, especially, has become a little out of hand, but that’s a major plot point, so whittling down the number of people/creatures would erase the entire point. I’ve had to make peace with the fact that it might get a little overwhelming for the reader in the first few chapters, simply because it must become overwhelming to my main character. The plot sort of revolves around it.
But that’s not the normal way I go about handling a large cast. In previous books, and even in a few short stories I’ve written, I’ve had to use a few tricks to keep everyone in line.