Also, I am totally calling them Charles and Erik, I mean I love the explanation for how they got to be called Professor X and Magneto, which is that the kids essentially came up with ridiculous nicknames for they're dads while they were goofing around, and they were having some SERIOUS fun there! and the mood they were in is exactly how seriously I can take people called Profeesor X and Magneto, I mean I get it as a kind of cover identity or role they play, and maybe in some verse(ses) they lose the rest of themselves mostly, but I can't see them thinking of eah other as anything but Charles and Erik and if they stay together that's who they are, SO! THERE!

TL;DR: Charles is so much nicer than Xavier (especially if you know the German version of Xavier, which is Xaver and is basically pronounces Ksafer, which is just not on).