Alright, I have decided to just put all of the Retros together, so bear with this.
Given that what Sakurai said about certain Retros was merely going through a process of elimination for his NES "ambassador" of sorts in Melee, those characters
will not be excluded (aside from Excitebiker, who will be on a separate chart due to being "revived" through Excitebike: World Rally). This is because characters like Pit, R.O.B., and Smash 4 hopeful Takamaru were likely on this list and eliminated for whatever reason as well, yet were added to Brawl or are seen as likely to be added to Smash 4.
One of the main issues though is Sukapon, who Sakurai actually said not to expect in the future. Out of fairness, however, he will be included as well. So without further ado, here is the list:
Pre-console:
Mr. Game & Watch
Sheriff
NES/Famicom:
Ice Climbers
R.O.B.
Balloon Fighter
Alice (technically, she's Game Boy, but she's part of the Balloon Fight franchise, which debuted on the NES/Famicom)
Bubbles
Urban Champion
Sukapon
Takamaru
Mach Rider
Tamagon
Duck Hunt Dog
Foreman Spike (was seen as separate from the Mario franchise on Sakurai's pre-Melee poll)
Fighter Hayabusa
Goku (Yuyuki, not Dragon Ball)
Donbe & Hikari
Mike Jones
SNES/Super Famicom:
Dr. Wright
Lip
Heroes of the Marvelous (Dion, Max, and Jack)
Mike Anderson/ST Falcon
Hakkun
Game Boy:
Muddy Mole
Sabure Prince
Anyone else to add?
For some reason, I would imagine Super Saiyan being just a powered-up state that Goku could use if he actually was in Smash. I see something like Spirit Bomb or even Dragon Fist as a Final Smash.
Oh god...
Didn't that end up being incredibly lame?
No clue.