All they said, is that they can add a MAXIMUM of seven additional characters (one of which includes Roy). So that is a MAXIMUM of six additional characters that were not originally playable in Brawl.
They never said that we would get seven additional fighters, just that there is the potential for it.
Ah ok great to know.. now I'd narrow down my list greatly.
Heres my new list from most importance to least:
1.
Mewtwo - I mean we're all pretty sure hes making a comeback, and he would be the most important/logical character to make a return
2.
Black Shadow with Ganondorf's current move set (Thus giving Ganondorf his own moves set) - In this case actually, the new Ganondorf would probably be taking a clone space because he may need to be created from scratch using another character as the base. Black shadow would just be Ganondorfs new skin, and they may need to change a couple of GFX and SFX
3.
Isaak - He would be such a great addition, and his moves set would be so diverse and also everything Antiguy said.
4.
Ray (custom robo) - This guy would be so cool, and I loved the custom robo franchise. I feel it needs to be represented much better in a brawl game and i really hope Ray (and Isaak) make it in Smash WiiU. Rays moves could consist of really cool bombs, machine gun and energy attacks that would create a really fun and diverse moves set. And for those of you who want Megaman in P:M real bad, I know Ray isn't the same, but hes got a bunch of cool similar tools.
5.
Sukapon - I actually didn't even know much about this guy until Antiguy's post about him. But I immediately decided that he'd be an amazing addition. I'm actually like 99% sure they're gona add him in Smash WiiU.
6.
Ridley OR
Dark Samus - Simple as this, we need another Metroid character, like comon! Dark Samus would obviously be the easier one to do so perhaps that is more likely, but Ridley is doable too (starting with Charizard as a base). There's already some decent Ridley hacks online. And the whole size debate shouldn't even be a debate. He can be the size of Bowser, problem solved. No characters in the game are to scale, so its fine if Ridley is slightly off too.
Other possibilities:
Andy (AW),
Saki (din and punishment) or
Waluigi - I'm having trouble deciding between these 3 because they're all last on my list, and I'm a little bit more indifferent to all of them. Waluigi could be a fun character to play as, I have seen some cool hacks of him, but I think he'd be last on my list. Andy and Saki would both be totally different and interesting additions. I know much less about them, but I have a good feeling about them. I don't know who to pick between the two. But in any case these last 3 are kinda my choices if any of the above don't make it in.