Oh man, I haven't been here in a while...
Chances: 36%
Pretty good if we get 2 Kirby and I consider 2 Kirby to be fairly likely, one of which will most likely be Bandana Dee. Marx is a pretty popular antagonist from a classic Kirby game which Sakurai tends to pull from a lot more than the other games. Star Allies DLC feels pre-planned, so it is entirely possible Sakurai knew about it beforehand and thus could be taken into consideration. Marx is popular fan-base-wise and considered an iconic Kirby character. His Star Allies set shows a lot of potential for what he could do set-wise, and the idea Marx's body type makes him "unviable" is goofy given Jigglypuff, Kirby and more in Sm4sh. He's still kind of far away and thus relevancy is an issue and he is firmly behind Bandana Dee in terms of Kirby characters, necessitating two Kirbs and beating out many other options, so I can't put him too high.
Want: 92%
This guy could have an awesome moveset, he's classic, he would be very unique, Star Allies provides him a lot of relevancy, he'd give Kirby a true villain since Dedede hardly counts any more, and I like his design, he has plenty of classic stuff to reference. Marx hype train, lets go boys!
Prediction
Lucina: 73.2%
Nominations
Micaiah x5