Hey. Lurker here. I posted a LOOOOONG time ago a request for the RWBY characters (Ruby, Weiss, Blake, and Yang) into Brawl, but nothing ever came of it. With Smash 4, I'm hoping this gets picked up. Especially since I have seen a mod already for Yang (it's got some rigging issues by the looks of it, but aside from that, it's functional).
Yang Over Captain Falcon
First, and easiest, would be Yang over Captain Falcon. Both use fists and fire for their attacks. Seems like a reasonable fit.
Blake Over Zero Suit
Again, this one seems simple enough. Both use guns with whip or whip-like attachments and both are fast. ZSS has no short swords, but I'd say that it'd be a small sacrifice.
Weiss Over Lucina
Originally proposed over Marth, but now we have Lucina who has the same moveset and weapon type, but with different chromosomes! Marth could still work too.
Ruby Over... Um... Ike?
Lack of a good scythe user makes this tough. Ike has a big enough weapon that it would be the easiest to change over to her scythe. But I've seen a few Marth/Roy hacks where they have a scythe, so perhaps Lucina would be just as doable. And she'd be faster too. This is one I'm not sure who fits best. I'm thinking Ike, but perhaps I'm thinking too much "in the box".
Not expecting a huge response to this. I understand this is a rather bulky request for a game that has only just started getting mods for it. But for those who read the whole thing, thanks for giving your time to the request of someone who merely lurks the forums and browses the vault. You're awesome.