(I'm probably gonna get flamed for this but oh well)
I don't think dating and anime girl/guy would be good. I mean, there are some things people can do that anime characters can't. Sure, they're cute, adroable and they have adorable voices but some of them are incredibly hyper and would wear you out in about a day. (Take Tomo from Azumanga Daioh) I think anime girls are the persocoms of this time. Same thing with Material Girls. -.-;; I'm on another forum and I had asked this question and alot of people went with real girls.
I mean, it's impossible and plus, anime girls/guys always have somebody to go out with!