Figured I'd take my shot at a roster. Unlockable vets in red, unlockable newcomers in yellow. The bottom, disjointed line is for post-release DLC.
[collapse=Reasoning behind placements and DLC choices:]
Mario (and related series) takes the top spot since they are the most iconic. Also since they all fit on one row together.
Next comes Zelda and Pokemon, signifying the three biggest series in Nintendo's repertoire, or at least the ones they always include in reveal trailers for Smash games. Zelda and Sheik are still a duo, and the Pokemon Trainer is still the Kanto trainer and thus has the same Pokemon lineup from Brawl (Squirtle/Ivysaur/Charizard)
Kirby would be the fourth, but due to a tradition whereupon Sakurai seems to like putting Kirby (his own creation) as close to the center of the roster as possible, I opted instead to put the Kirby series on the right so that Kirby would
be right next to the random select in the center of the CSS (if not for the random select, Kirby would, in fact, be right in the center of the roster). Star Fox takes the left side, followed by Mii and Ice Climbers as filler positions due to the fact that there wasn't anywhere else to put them with the theme I had developed.
Fire Emblem starts off the fourth row, and this is pretty straightforward - Fire Emblem sword users, check, Shulk, Isaac, Pit = sword users, check. Palutena sits next to Pit and breaks the line, so Samus and Ridley fill the other half of the row, surrounded by fellow captains - namely, Olimar and Captain Falcon. Zero Suit Samus is still included, and the two are now interchangable much like Zelda/Sheik and the Pokemon Trainer Pokemon
.
The last row is dedicated primarily to retros. I realize I should have switched Little Mac and Villager for better flow, so that it would be Lucas and Ness for Earthbound reps along with the Villager, another child, beside them (because of his ax and the whole meme that developed from it, I opted to put him underneath the other sword users). Little Mac would then fall alongside Takamaru, his supposed East Meets West rival and former fellow retroite. Wii Fit Trainer, meanwhile starts sits beside them, followed by a three-robot chain of Mr. Game & Watch, R.O.B. and Mega Man, who also start begins the 3rd-party reps, namely himself, Sonic, and the Pac-Man ending the roster.
The last row features a total of eleven post-release DLC characters. My reasoning for their inclusion:
Porky because he's a major antagonist in Earthbound/Mother, and while I had previously included the Masked Man on this roster in times past, I am convinced that between the two, Porky would be more interesting, especially as he wouldn't have to rely on PK attacks [so much].
Mike Jones falls beside Porky (the two being under Ness and Lucas for obvious reasons) due to the similarities in both, being that they both use yo-yos. Also, being that he was a Western-only character, it would be good reverse marketing for those over in Japan, in the same lieu of Fire Emblem being introduced to the West.
Chrom because he's seems to be the most-likely Fire Emblem rep to be added after the other three, so he falls here where he'd fall in the same column underneath a fellow RE rep (since the first two spots are taken by Porky and Mike Jones).
Impa because she is the most reoccurring character after the main three, and because as a fellow sheikah, it would be fast and easy to create for her a luigified Sheik moveset (all characters are luigified if taking inspiration from characters already included). So put because she falls in column line with another Zelda rep (since the previous three slots have been taken).
Wonder Red for superhero and awesome potential. After everybody else, there really wasn't room for him anywhere else in the row, so he doesn't really follow after anybody column-wise. There is also really nobody (except possibly Captain Falcon) that he could be a luigified clone of, and he shouldn't be anyways. He would be the most original of the DLC characters (followed by Porky and then Sukapon and Chibi-Robo)
Goku (not the DBZ character) because he's awesome. Personal bias aside, he uses a staff, and has lots of inspiration for a moveset since he's based off of Journey to the West legend. But there's also the possibility that he could be a luigified clone of Krystal (in my roster, I see a trio of Zelda, wielding magic; Krystal, fighting with a staff; and Palutena, fighting with a mixture of her staff/wand and magic, and acting as a buffer in-between the two) due to the staff or possibly even a luigified clone of Palutena. He is placed in his spot for dual reasons: One, he falls in the column with Donkey Kong, a fellow primate, and while he would be better placed underneath Palutena due to her status as a Goddess and his as the Monkey King (as well as better size comparisons with Diddy over Donkey), falling under Pit is a fair compromise.
Sukapon lies beside Goku, the both of them bound by a common, Japan-only exclusivity. As Sukapon is a robot, it would obviously fall underneath another robot, which is why it takes the spot he does over Goku (as Wii Fit Trainer is not a robot). The introduction of Sukapon and Goku, their being Japan-exclusive much in the same vain Fire Emblem was, would serve to bring two awesome characters to the Western Casuals' eyes, the same as Mike Jones would do in reverse. Having come from a fighting game itself, Sukapon has plenty of potential inspiration from its own series, as well as likely being a quick and easy character to model and create due to the simplicity in its design.
Chibi-Robo, also a robot, comes next. I could see him having attacks similar to Pikachu (since both are electricity-based), though on a humanoid body as opposed to on-all-fours, though he would and should not be a luigified clone.
Sylveon next because of being a Gen VI rep (Pichu added for Gen II relevancy, Lucario for Gen IV), though she obviously hasn't been really advertised like Mewtwo's new form or Mega Lucario. Still, she represents the latest in the popular Eevee line, and due to her nature, she could easily be a luigified clone of Ivysaur with a few Jigglypuff Fairy-type references thrown in (as Jigglypuff will likely get retooled a little with new fairy moves). Speaking of, Sylveon falls in line column-wise with Jigglypuff, since both share the Fairy type between themselves.
Sami, of Advance Wars fame, is an interesting case. Originally, I had included her in the main selection in the first form of this roster (her and Isaac were switched in that regard), but found no place for her this time around. That being said, with the advent (in this roster) of Snake not returning, Sami is the only character with enough relevancy to her own series (being on equal footing with Andy as a co-main character in later AW games) and a canonical moveset that would work for her being a luigified clone of Snake, with Advance Wars references in her mvoeset replacing the ill-fitting MGS-based moves Snake has. However, since Snake is not coming back, Sami, even in her lugified state, would be the only thing left of his moveset for those who play as him, and it is for this reason that she falls underneath Sonic (since Sonic and Snake were the two 3rd-party characters in Brawl).
Last, but not least, is Black Shadow. He's here at the end obviously because of Captain Falcon, and he represents a major antagonist role coming from the F-Zero series. Nothing too special in terms of moveset, just the usual form of giving him Ganondorf current moveset and retooling Ganondorf into something more befitting of his Zelda nature (of which he'd have already at release, with Black Shadow coming in later as DLC for those who preferred Ganondorf over Falcon in Brawl). It would definitely fit Black Shadow better, seeing as he and Falcon are from the same series, which would justify their having similar moveset styles.
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A total of 54 roster slots, a nice number. As well as 11 post-release DLC characters (more wishful thinking on my part than actual prediction), for a total of 66, and the Trainer Pokemon and ZZS and Sheik, for a grand total of 70 playable characters. Insanely high, I know. I had to make sacrifices (namely Snake, the only vet cut, and Dillon, who is one of my most-wanted characters and I didn't realize wasn't on the roster until all the slots were full and I had no way to justify his inclusion over anybody else except the Mii. With their inclusion being very likely, however, he had no place, and therefore didn't make the cut (If he was included, he would switch with Ice Climbers due to his status as an anthropomorphic armadillo both fitting visually with the Kirby characters and also the Pokemon characters).
But anyways, thoughts?