What about Pit? He's probably one of the best representative characters from the NES/Famicom era...
On that note, you know which characters I would LOVE to see in this game?
Kuros from Wizards and Warriors, and
The main character from Faxanadu.
They could also throw in a couple of extra levels, such as the forest from W&W or the Foggy area of Faxanadu. Furthermore, it would be nice if they included the absolutely awesome music from those games as well.
Aaaah... Man, if that ever happened my life as a gamer would be forever complete...