I grew up with the NES and liked both Punchout and Super Punchout, so Little Mac being in the game is much cooler in my opinion than the Wii Fit Trainer or the Animal Crossing villager being in the game.
Although this is old, Mega Man is an awesome addition and with the announcement of Mega Man, I really hoped that Nintendo would get some other big name third party NES characters. Not a lot. But with Mega Man, I was hoping for both Ryu Hayabusa from Ninja Gaiden and Simon Belmont(with CV2 Simon clothing or Trevor as costume changes) from Castlevania. My three favorite NES characters