This might be a fun thing to think about (or maybe it'll be the most boring thing anybody's EVER thought of, who knows! :O):
Which 5 characters would you like to play as clones of the most? And what would be different about them, to justify them being in the game?
For me, I think I'd like:
1. A DK clone, with a light body who's faster/weaker. This would make DK's tilts really interesting. Some of his aerials might need an adjustment (like dair), as well as his smashes (maybe all of them!) It'd be interesting to see what this character would be like if it retained the grappling game, too.
2. A Zelda clone. She's just really fun to play! Since the PMBR changed up her side-B quite a bit, it'd be interesting to see what else they could do, since the "trap" gameplay is kind of her thing now. Also, it'd be interesting if this particular clone didn't have the "change to Sheik" down-B, and got a new move instead. You could kind of go either way here - you could make her heavy and strong or light and fast. Or you can even do a falco thing, where the speed's relatively the same and you just change up the move properties.
3. Bowser, fa sho! I've said this before but I really don't enjoy Bowser. I think a fast version of him with a different uair, dair and usmash would be sick, though. There are some things about Bowser that should probs stay, like his tilts, fair, etc.
4. A heavy Pit would actually be pretty sick. He's another that I just can't get into at all, for some reason. (To clarify, this isn't a Project M thing - I never really liked Pit in Brawl, and I didn't enjoy Bowser in Melee or Brawl.) I think I don't like Pit cause he tends to feel flimsy, so a heavy version with some heft to his attacks might be awesome. I'd be interested to see what they do with his jump game/recovery, in that case.
5. A Sonic clone! I love his playstyle, but he's almost too fast if that makes any sense. A character that's slower and heavier would be an interesting take on that gameplay. I don't even know how many moves you'd need to change, tbh! Just making the character slow and meaty might be enough.
Kind of weird to think about this without the characters attached to it, haha. Some of these match up to things I want - Dixie could be the DK clone, Baby Bowser could be the Bowser clone, and Skull Kid could be the Zelda clone. Tails/Knux/Shadow could probably serve as the Sonic clone, and then I have no idea who would go over Pit?
So my gameplay-based roster would be:
Dixie
Skull Kid
Baby Bowser
Tails (ah'm pickin' Tails!)
?!?!??!?
That's kinda interesting.
These aren't my votes or anything, but if anyone else wants to take a shot at this, it was kinda fun. (Disclaimer: You might hate it and hate me and hate everything I love if you try this)
And Takamaru's a samurai, not a ninja.