1.
King Dedede - My favorite Nintendo character and my Smash main. Aside from just making a lot of sense, it's pretty much my sworn duty to try and get him in here as quickly as possible.
2.
Mewtwo - My nomination, I stand by what I wrote up about them initially. It's just the next practical step for Pokemon.
3.
Lip - Now you're speaking my language. Great choice and a suitable replacement for the unexpectedness / unfamiliarity of characters like Ice Climbers or Marth respectively. I'm also convinced Sakurai has a sweet spot for this game, given the obvious influence on Meteos and the oddly striking resemblance that Green Greens (Melee) has to Panel de Pon's gameplay layout.
Job 9: Black Shadow
I'll be the basic one and throw this out there. As you can see, I'm using the F-Zero X design since GX hasn't come out yet. Perhaps if Black Shadow is added to Smash, they will make design adjustments that would have a lasting effect on the series proper. As everyone probably knows it's become a common fan tradition over the last however many years to want Black Shadow to adopt Ganondorf's moveset - nowadays I don't think that's practical, but had this been established in Melee instead... that could have definitely worked, arguably way better. I think he's pretty damn cool and F-Zero was still an active series at the time, so it'd be nice to give it a bit more love while it's reasonable to do so.
I really like Knee's concept for Ryota too, though. Whether it's Shadow or Ryota, it just feels right to give Falcon a clone.