Collecting Characters.

I've been working in my BEAUTIFUL CREATURES world bible lately.  Adding a lot of new characters that have just lately popped into my brain.  They're not even in the current story I'm working on, but I can see a use for them in future stories.  Here's a few of their names: Britt, Leo, Rook, King, Domingos, Gunnar.
I think it's a good idea to look ahead when writing a series.  If you can foresee characters you'd like to work with in the future, then trying to mention them in your current story i...