Huh, ironic. I actually had just finished an couple hour long session of Smash 64 with a friend this morning. Good stuff. I've always appreciated the super comic book-like nature of it in comparison to Melee and Brawl. Sure, it's a "crazily unbalanced mess", but it's
the "crazily unbalanced mess", and that's what makes it totally fun in my eyes. It's also the only game which I'm actually attracted to playing as and maining Mario, for some reason. Fun facts.
Absolutely love those old commercials, too. Making me all nostalgia hard already, and I've only been a member for less than half an hour? That's a new record.

I was just a kid when the 64 came out. Smash had me hooked from the first time I had ever rented it from Blockbuster at like, six.
As far as the Wii U iteration goes, I know we're in for a fight of epic proportions here (at least, you know, ten to fifteen characters more than Brawl, that is :>), so I just hope we get a more proper online experience. Brawl's Wi-Fi Room for me was all kinds of laggy or buggy, but I LOVE the idea of playing with all of my Smash friends all around without those types of communications problems, and with all of this focus they've had with pre-E3 "Miiverse" events and all, I don't think we'll have that sort of problem. This is bound to be great.
As far as newcomers go, I just really want to see those who would've been obvious for a Brawl or Melee inclusion included now. King K. Rool, for instance. I'd also personally love to see Shulk, though I know that's like a 50/50 shot right now. Everyone at that cancer GameFAQs board for SSBU likes to bash me and others with a similar mindset just for that. No likey. Just my wants, though. Not going to force 'em down anyone else's throat.
The "lol it's not gonna happen" want for me? Momohime from Muramasa: The Demon Blade. Now that'd be unreasonably badass. Loved that game with a burning passion.
@Star - I've heard of that rumor passing around GoNintendo. The Last Story, to me, was a piece of writing genius. I do hope we see a sequel, just to knock Sakaguchi out of retirement one last time. That'd be so great. There's lots of untapped game potential there that shouldn't go to waste.
@Yuiitusin's post below me lololol - I know right! I loved those guys; wouldn't mind if we see them again this next generation. They provided much lulz. And thanks for the welcome! LOL @ the PlasmaCannon bit. Yeah, I don't think anyone can quite take him so seriously, anyway. It's a bit of a nice comedy act seeing some of his posts.

Lip, I do agree with him would be nice to see in some form, though.