You got to interview Rick Riordan? That's so cool! I must say, he seems like a really friendly, wonderful guy. I sent him a message back when the Healing Angel was reading and loving the Percy Jackson books, and he wrote back--what a gent!

And I used to love crossovers in stories--when characters from one would feature in the stories belonging to another set of characters. I remember Edward Eager had that in his books, and I feel like there were others that featured crossovers that I'm not recalling just now.