Remember, this is all my opinion
Key:
Character is confirmed. 100%
Character is a shoo-in, or has been semi-confirmed. 90% and up
Character is likely. 70% and higher.
Character is possible. 50% and up.
Character is not likely. 50-40%
Character has almost no chance. 40% and lower.
Mario series:
Mario
Bowser
Princess Peach
*Luigi
Who wouldn't include him?
*Geno
He'll blow up Japan, nuff said.
*Bowser Jr.
Well, this one is possible. He could have an interesting moveset using his paintbrush/Shadow Mario.
Yoshi series:
Yoshi
*Kamek
A good choice for a Yoshi rep, the main antagonist of the series, and he'd be a unique majic user.
Wario/Wario Ware series:
Wario
*Other Wario Ware rep:
I don't see there being a WW rep in Brawl, but it's not impossible. Mona, Jimmy T, or maybe Ashley could fit.
Donkey Kong series:
Donkey Kong
Diddy Kong
*King K. Rool
Well, he'd be a unique add, and he is the antagonist for DK. I could see him getting in.
*Other DK reps
I don't think there would be any other rep(s), but it remains possible. Probably Dixie Kong for example.(etc.).
Zelda series:
Link
Princess Zelda
*Shiek
I see her/him returning under Zelda's move set again. The fact that TP Zelda is being used, or tht she/he should be a stand alone character seem like arguments that aren't a real issue. I'm not counting her/him as an individual rep.
*Ganondorf
Returning with a new moveset. Not many people disagree.
*Midna
A very popular character in TP. She has recent popularity, but has only been in one game. Remains a maybe.
*Cel shaded Link
Well, he remains a very popular version to date, but I don't think we're getting any "different versions" of characters already represented. He still remains a strong possibility.
*Other reps
Vaati, Zant, Mask Link(New Young Link) and Tingle. Each has slim chances, but have a chance at least.
Kirby Series:
Kirby
Meta Knight
King Dedede
Enough characters for Kirby
Mother series:
Lucas
*Claus
Remains a strong possibility, would serve as an antagonist, and is bound to have an interesting move set.
*Ness
Very unlikely. I only say Ness still has a very small chance of still being in.
Metroid series:
Samus/Zamus
*I'd like to point out, I don't count her as a full rep, but a transformation of Samus
*Ridley
Clearly one of the most requested characters. Ridley would be an awesome addition to the Metroid reps.
*Dark Samus
Perfect canidate for the 3rd rep. The main antagonist in her games, and would be a very likely, if it wasn't for Prime's low popularity in Japan. I still say she'd be a good rep with decent chances, and NO, she would not be a clone of Samus.
Starfox series:
Fox
*Krystal
Shoo-in, female, unique move set, more SF reps, I could go on...
*Falco/Wolf
This one I belive will come down to Sakurai's preference. Wolf is very popular, and could serve as a villain for SF, but he could be somewhat "clone-ish"(I personally think he won't be a clone) and Falco was already in Melee, and was a clone in it. If they can come up with an original move set for Falco, I'd love to see him in it as well.
*Falco/Wolf
4 reps for SF? Why not? It's possible.
Fire Emblem series:
Ike
*Marth
Immensly popular, most re-occuring FE Lord, had an original move set. I can't think why he won't return.
*Micaiah
Very unique magic user, female, latest FE Lord, and DOESN'T USE A SWORD!
*Other FE reps
There is many other plausible FE characters, question is which ones would be best? Eliwood, Sigurd, Black Knight and a few more would be good choices.
*Roy
Will he return? Many people think not, but it remains a possibility. Clones nay return with new movesets.
Pokemon series:
Pikachu
Pokemon Trainer
*Mewtwo
Why remove him? The thought that people think he'll be replaced by Lucario is insane. Mewtwo should return, either buffed up like Bowser, or with some better moves.
*Jigglypuff
If she doesn't return, you will wake up tommorrow with marker scribbles on your face.
*Lucario
Lucario has a pretty high chance of being the 2nd new Pokemon rep, but he should get his own moveset, not Mewtwo's.
*Other Pokemon
Not very likely......maybe if Lucario is deconfirmed...but still very unlikely.
F-Zero series
*Captain Falcon
FALLCCONN PAAAUUNCHH!!!!
*Black Shadow
Well, he's a villain at least, maybe..
*Other Z-Zero reps
In your dreams! Jk, but not even almost near unlikely.
Retro series:
Pit(Kid Icarus)
Ice Climbers(Ice Climber)
*Mr. Game&Watch(Game&Watch)
Any arguments?
*Sukapon(Joy Mecha Fight)
I've seen his game, and it's not bad. He'd be an obviusly good fighter, and remains at a decent chance.
*Takamaru(Nazo no Murasame-jo)
Well, he's got fans! And a sword!
*Lip(Panel de Pon)
Umm....no comment.
*Balloon Fighter(Balloon Fight)
He'd be very interesting to say the least.
*Mike Jones(StarTropics)
WHO? MIKE JOONES! Sorry. Well, the no JP thing hurts his chances, but he's gots lots of US support.
Other series
*Isaac(Golden Sun)
Hmm...I don't see why not....but it does seem unlikely..
*Ray(Custom Robo)
Awesome! Well, he's a good idea for a rep, just pick which one(I'd like Ray 01).
*Captain Olimar(Pikmen)
Well....he's got Pikmen. I personally don't know if his chances are that high, but he seems likely.
*Animal Crosser(Animal Crossing)
I honestly don't know why people want him...
Third parties:
Solid Snake(Metal Gear)
*SNNNNNAAAAAAAAKKKKKKEEEEE!!!!!
Sonic the Hedgehog(Sonic the Hedgehog)
*Sonic the Hedgehog
*Bomberman(Bomberman)
Well, he's a pretty popular dude. That, and Nintendo and Hudson are BFFs. Many games on Nintendo consoles, and a cross-over with Wario, B-man's got it going for him.
*Mog the moogle(Final Fantasy)
I know I'm gonna get flamed for this T_T
Mog was the mascot of FFVI (FFIII in the US), and would help promote the series as a whole. Plus, moogles are very popular in FF, right up there with Chocobos. If you're gonna flame me, at least read these
arguments
*Mega Man(Mega Man)
I still think he's got a chance, he was not flat out deconfirmed. He's obviously popular, and if there is any hope, he'll still be in.
*Other 3rd party characters
I'm already pushing it with 5, I don't think that many others stand out. A few honorable mentions are Kloanoa, Slime(DQ), Pac-Man(wakka wakka), other FF reps, and a few others I can't think of.
__________________________________________________________________________
Accumulated total roster.
Blue character total = 22 characters
Green character total = 29 characters
Yellow character total = 44 characters
Orange character total = 49 characters
Dark Red character total = 54 characters
Red character total = OVER 9000!!!!