(Prediction, not wishlist)
You ask; I'll deliver my thoughts :D I posted something like yours back on another forum, so yeah, bit of a repost. Even with cutting off some parts, It's still pretty long O_o
This'll start off with "Veterans with a possibility of being cut (Or being Downloadable Content)" Honestly; This section won't be big as aside from sonic, the rest of the roster was decided at 2005.
Ike - While he's the only reoccuring lord asides from marth, there's a chance of him being cut in favor of a lord from FE *Insert number here*
Lucario - Read: Ike...Or he may stay, see jiggs.
Snake - This is an iffy one. I personally think that sonic and snake won't be in the next one so they can hype up new third parties, despite my like of them as characters, but with lack of interest from other companies...
Sonic - Read: Snake
ROB - This is an iffy one. Really, he seems more there for the SSE Mainly than a WTF Ending character...And to god how I hope they don't spend a TON of time on that mediocre platform, again. But really, this isn't based on what I'd do, It's based on what sakurai would do. Chances are most of these will stay, especially after the complaints of "OMG SOMES MELEE PPLZ GOT REMOVEDS"
Falco or Wolf - Well, If they do actually end up making room for krystal (Let's note: Brawl's poll suggestions take place now, not during brawl) then chances are one of these will be removed (Or possibly DLC) And I can't really see wolf being replaced, as representing the series by "The Hero, The Sidekick, The...Girl Sidekick?" So, I don't know.
Melee Veterans:
Roy - FE Is a shaky series...He got close from what I keep hearing, and sales figures certainly like him, but If he was cut once, especially at the near end, then honestly, I don't know.
Mewtwo - Unless they change pokemon trainer, I really don't see this happening on the on-disc roster...But It's not completely out of the question. - BY PT CHANGING I MEAN BY HIM REPRESENTING ANOTHER SERIES THAN FIRST GENERATION.
Pichu - ...Wasn't even on the files. Hey, DLC Can fix a lot of cool stuff, but enough about that.
Doc - Better as a costume or another form or so. Really, only thing he has going for him at all is the files.
Possible Newcomers:
Mario Series: Bowser Jr., Geno, Paper Mario, Toad
Reasoning: Rosalina was just a side-character for one, possibly two games. Really, If a 5th rep is to happen, It comes down to these 3 (Well, 4...I disagree on toad a bit personally but this list isn't all about me). Each having flaws, each being suggested, and each one would bring something unique to the table. Only one sakurai and devs have shown any interest into are geno. Oh the on-going debate on this.
Oh, and Wario and Yoshi go under here too.
Legend of Zelda Series: Tingle, One Time Character (Or something similar of the sorts, or another cel character to go with TL)
Reasoning: Files of Toon Zelda, fun. IF The series gets another rep (Which If mario and Pokemon do, that isn't doubtable)
Pokemon Series: *Insert 5th gen rep here*
Reasoning: You really see much probability outside of this? Could still have Lucario or Mewtwo If the big 3 exceed to five.
Metroid Series: Ridley
Reasoning: If they're to get any new character, It's this dude. It all comes down to programming issues. Fun.
DK Series: Dixie, K Rool
Reasoning: Only major thing I really see dixie have going for her is the files, and that could've been with diddy. The series is for sure popular to get another rep, so If they're denied another rep, we know who to blame. Question comes down to who.
Starfox Series: Krystal
Reasoning: ...Uh, you really think anybody else outside of this is likely, if SF Even gets a newcomer?
Fire Emblem: Read: Pokemon. It really depends on where the series heads in the future.
Kirby: Has It's core character's and no other character's really suiting, even for DLC.
F-Zero: Goroh, Black Shadow
Reasoning: I don't know enough about it to REALLY Put a judgement on which ones more likely...I guess goroh especially considering he's an AT. Really, F-Zero has been only falcon for 3 games. Time for him to share the spotlight a little bit.
Mother: Claus (Masked form, obviously)
Reasoning: Really, the main thing he has is to sakurai, he ranked up there on the mentions journal with characters like Geno, Krystal, and King D3, and It's really his interest that comes first + He's the only true runner up for a 3rd rep...Sure any other's may have a .0000000001% Chance, but that's not saying much. As much as I really want him in, it really comes down to what sakurai thinks.
Retro: ...Who knows?
Reasoning: Sakurai has shot down a lot in the past, like sukapon being hard to program, or balloon fighter needing balloon's. One is usually the starting character, the other is usually the unlockable "WTF"...
...Or there's the possibility of only one or no retro's in this next game.
New Franchises: Isaac, Little Mac, Possibly another one/more.
Reasoning: Considering most franchises are really complete at this point or would be killing off someone to add in someone new, newcomer possibilities come onto this a lot more than brawl did. I see Little Mac/Isaac extremely likely (If we don't see one of them then o_o) Any others beyond? Depends on how big the roster is, and If sakurai is willing to bring new franchises outside of "lol, assist trophy"
Third-Party: Megaman, Travis Touchdown
Reasoning: MM: Do I have to explain? TT:Suda 51 wants him, so it could be another snake case, of course, there's always possibility of other's for the 2 third party slots.