I think it's cute. If you both love something, why not make it part of a ceremony that's suppose to be about bringing you together. If they both love it, then WHY NOT!!!
My buddy had a kind of Anime wedding. There was a big oriental theme, the bride wore a really nice chinese dress and the wedding march was Aeris' theme from FF7. It was pretty nice...not overboard, but it was different which made it more fun than a traditional wedding.