I'm Megan and I've got a couple of kiddos for your characters to interact with! I've got this lovely lady, Natasha Romanoff who depending on what you have in store for Billy, might know him or might get to know him? But either way, yay! young avengers! I also have two that Charles might know (one for sure, one sort of ish?) First Piotr Rasputin (unmelting) who thinks the Professor is kind of amazing and is probably one of the most loyal people ever to don the X-Men uniform. And Theresa Cassidy (therebelyell), daughter of Sean Cassidy a (former? current? I can't remember where Sean is right now off the top of my head haha) X-Men and at one point or another has hung around the mansion when vising dear old dad once they realized that the other was, well, you know, alive. haha.
Anyway, I'm always up for stuff, so please feel free to get a hold of me! :D