King Boo would be an interesting character even though he has no specific significance to the Mario series. Ghirahim is eh. No Shulk, Isaac, Tom Nook, Chibi Robo...any new series rep in general.. Travis and no Mega Man.. even though Travis isn't unlikely considering his creator and Sakurai are buds. F-Zero doesn't really need a rep. Why should we waste a roster slot on a minimal series not a lot of people care about? (don't get offended F-Zero fans) Overall 4/10.
My Dream SSB4 Roster - http://tinyurl.com/az7b2j4 3 months until E3! *fangirls*