I like that idea a lot
I've got an interesting idea: item exclusives. Every character has a special item that will only appear when they're in the match, i.e. a Tanooki Suit when Mario is around, a Luxury Ball when Pokemon Trainer shows up (releases only good Pokemon and a much higher chance for legendaries to appear; no bloody Goldeens), etc. Anyone can pick up and utilize these items, of course.
That's a great idea. ^_^
The thing about SMRPG is that Square Enix already denied it. Here's another thing, though: Even if Square Enix joins the showdown, they won't accept an SMRPG character. It's not popular enough, and not tied enough in people's minds to Square Enix itself.
As much as I like FF7 and Cloud (not the over-emo'd KH and AC versions), I would hate for him to join Smash Bros. for obvious Ike-like reasons. If Square Enix DID join in, though, they would of course want to submit their most popular character, which is Cloud by a landslide, being the titular character of sorts for Square in both Japan and overseas alike. Square Enix would never hear the end of it if they went with ANYTHING other than the Cloud-playable, Tifa-assist combo.
Sorry Geno fans either way, and sorry online players if Square Enix does jump in, because you'll be seeing Cloud, Cloud, Cloud.
And on the note of Earthbound, I nominate Mr. Carpainter as an assist. Essentially, he's Nintendog but instead of being really ****in' annoying and blocking the screen, everything is painted to a shade of blue.
I have no problems with Cloud as a character (particularly not the supposed-"emo" Cloud everyone complains about-- but this isn't the thread for that...), but with his fanbase, holy hell do I. Wiichat had a "if Cloud joins the Brawl" thread some years ago. It wasn't pretty.
Good thing we're 99% guaranteed to never see hide nor hair of Square in SSB.
And then Cloud being Final Fantasy's defining character is obvious. He and Sephiroth both have huge roles in each Kingdom Hearts release, AC created a legion of fans who've never even played the original game, and it was only expanded upon with the popular Crisis Core. I also found it funny that in Dissidia's credits where every character in the cast was listed by game order, the only exception was VII, with Cloud and Sephiroth being the first two to appear in the credits in their own spot haha.
I actually wouldn't mind having Cloud in the game personally (I've wanted to see Cloud and Link duke it out), but when I think about how every match would be 9/10 Cloud, I have to cringe. Well, like said before, Square Enix at least currently wouldn't join in. There is a whole good 2 to 3 years of development for the game before it would be too late to add a character from scratch for SSB4 though, and that's just assuming they actually started after Uprising was done. It's probably a bit longer.