I honestly don't think those are the most deserving characters. I feel your best choices are into the "characters that have huge potential but shouldn't be in the game yet but instead in later installments" section.
I don't think that StarFox for example needs FOUR representives. Two or three would be fine with me, but four's really too much. I doubt even Mario will get more characters than four since Mario's obviously dropping Dr.Mario, and Geno is in my opinion way too obscure to make it.
Also you have too many 3rd party characters in my opinion. Bomberman, Megaman and Geno. A little bit too much I say. I half agree with Megaman, but Bomberman and Geno aren't nearly as important as Megaman.
I'm still wanting Sheik to get removed, and after I've read your thread about Lucas replacing Ness I can't quite understand why you don't see Sheik's return as so obvious since Zero Suit Samus could easly be her replacement. Marth I can atleast respect however I'd rather have Sigurd, and if I had to choose 3 StarFox characters I wouldn't want choose Falco. And even though Young Link could easly be unique I'm strongly against double characters in Smash.
Still I like how you've kept Mewtwo, and not replaced him by Lucario as many people here tend to do. >_>; Krystal I love aswell, she atleast brings something more unqiue with her ; the staff. That, and I actually liked
Dinosaur Planet StarFox Adventures even though the StarFox features REALLY felt outa place and Nintendo should just had Rare making their own game... But I'm getting off topic here now.
Captain Olimar and Claus sound promising, however I've yet to play Mother 3 and never played Pikmin. Claus would be cool for having another Mother character, and I acknowlegde Olimar's uniqueness.
Mach Rider seems unlikely now that Wario's got his Chopper for his B moves, and I know nothing about Custom Robo but I'm not all too excited about Ray 01, he too seems a little too odd to make it in.
Ridley and King DeDeDe speak for themselves, everyone almost has these guys on their list and after Diddy, Wario and MetaKnight's inclusion these are probably the most likely and deserving characters yet to make it.
Takamaru and Sukapon look interesting, but I fear both will end up being Assisst Throphies at best. Still, Takamaru has a nice shot now that both Lyn and Samurai Goroh both got deconfirmed but it's still a big maybe.
Animal Crossing Human is an idea I'm also against. I've only once played a little Animal Crossing and I quite liked it, but I really wouldn't like this character being playable. He can easly be unique - that's not the problem, that's also why he made your list but a counter agruement of yourself about Ness was something in the lines of "What would this character's backstory be in the Subspace Emmisary?". Thusfar, it seems every character could have quite a nice backstory (yes even the Ice Climbers) but the only thing I could think of for Mr.Generic here is bad memories about dececed plants come and haunt the Animal Crossing Human... But then again, I don't know Animal Crossing that well, but I can't possibly see this guy having a deep backstory (not that a DEEP backstory is needed ofcoarse, but atleast SOME... O_O).
However the biggest thing which I'm not agree with is this particulair line:
However, I do think that he would make a pretty good third DK rep. He is, after all the main villian of the series, which alone gives him a lot of merit, really. However, anyone knows that he doesn't really have much potential for moves, although I could see Sakurai giving him some pretty good and powerful moves.
Okay, I don't question your overall reasonings but THIS? K.Rool has so much potential to have a great all unique moveset. People are screaming Bowser clone way too much, but this croc easly beats out the fire breathing turtle in unique and awesomeness! In every Rare DK game K.Rool appeared in, he always fights differently.
In Donkey Kong Country he appeared as King K.Rool, the most common way how people see him. However, his true moveset potential comes with DKC2 (the coolest and best game of the DKC trioligy!) where he appears as Kaptain K.Rool, and fights with a huge blunderbuss which is able to shoot cannonballs, different sort of gasses and has a sucking ability and invisibility, that and he wears awesome pirate gear. In DKC3 K.Rool is known as Baron K.Rulenstein, who has a jetpack for a possibly Up B, and a huge robot CHAOS controlled by DK and Diddy's brains for a possible Final Smash. That, and he appeared as a boxer in DK64 which would give him quite some wacky tilts and Smash moves perhaps. It's unfortunate that DK Jungle Climber isn't released here in Europe yet, but from what I've heard K.Rool will also fight differently there.
And if StarFox is getting 4 reps, why does the more famous and better selling Donkey Kong just get 2 characters? Somehow I don't think that's fair, but hey I've atleast got my Diddy so I'm happy. =)