So a lot of people seem to be expecting this character select screen to pair with others predicting similar rosters plus Ridley, Mewtwo, Dixie Kong, and the Chorus Kids, such that those characters fill remaining spots on the character select screen.
I don't think that works.
Let's look at Row #2.
We can see that this row is packed with DK, Zelda, and Metroid characters. Adding even one more character to any of those games would cause it to overflow, forcing characters to the next row. Whether we add Dixie, Ridley, or both, we end up with Metroid characters split between Row #2 and Row #3. This strikes me as difficult to believe; that's how in-progress rosters work, not completed ones. The only way to fix it would be if we got either another Zelda character or a standalone character (like the Chorus Kids) somewhere else in the row to finish forcing the Metroid characters out.
So if we assume Dixie and Ridley, plus the Chorus Kids where they'd have to be, we get rows #2 and #3 looking like this:
Donkey Kong | Diddy Kong | Dixie Kong | Link | Zelda | Sheik | Ganondorf | Toon Link | Chorus Kids
Samus | ZSS | Ridley | Pit | Palutena | Marth | Ike | Robin | Kirby
Another problem! By adding two characters before them, the Kirby characters start getting pushed off Row #3. And Mewtwo isn't any place where it'd affect this. The only way to avoid a split Kirby roster would be if the unlisted fifth character is somewhere before Kirby.
But let's roll with that. Let's say that fifth character can show up somewhere useful (say, by being Ice Climbers) and pushes Kirby down to Row #4, so that the whole Kirby series is in a row there. Does that work? Let's see how Row #4 looks now.
Kirby | Dedede | Meta Knight | Little Mac | Fox | Falco | Pikachu | Charizard | Lucario
No matter where you stick Mewtwo, there's no fixing this. The Pokemon roster is split between rows #4 and #5 and there's no preventing it. Not without arbitrarily teleporting large numbers of characters around the screen, that is.
CONCLUSION: It is possible to add five characters to the "leaked" CSS to make it take on the shape of a rectangle. However, if that set of characters includes DK and/or Metroid characters (as in the Ridley/Mewtwo/Dixie claims people like to link to this), Brawl-style CSS scrolling will displace the previous characters in such a way that will result in splitting even more series' character lineups. Therefore, I do not believe the Ridley/Mewtwo/Dixie roster is compatible with the "leaked" CSS.
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