Let me get this straight, a guy wants to marry a ficional character? What if he and some other moron wants to marry the same character? I mean, a fictional character can't choose betwixt to real life idiots.
My only real answer to this is:

Hey, moron! Move out of your parents' basement, stop wacking off at comic books and get a LIFE! You don't hafta get married to a 3d person. Get a hooker.
Look, I love Velma Dinkley, but I live in reality and she lives on a TV show. Somehow I don't think we're gonna hook up.

So either get your mind back in reality or get some shock treatments. It's this kinda thinking that George W. Bush relected twice!