1.) Honestly, I kinda agree with the "won't get more than one character per series" thing with every situation but Dixie and K. Rool. I don't think we'll get both, but I do think it is fairly likely we COULD get both, since both are very iconic DK characters and both deserve a playable role in Smash. As a whole, K. Rool probably has a slight edge both in popularity and in importance (main antagonist), but Dixie's also very important as the third most important playable character. However, I'd say "main villain" is a more important role than third main protagonist.
2.) If Chorus Men legitimately were planned, I can see them as a viable DLC candidate. If not, I can't see them being DLC at all.
3.) I honestly don't think its going to happen. The main issue is, Sakurai has stated that characters aren't likely to be considered if the franchise isn't likely to continue. He's done a similar things with certain characters in the past, namely with Ganondorf; he was hesitant to add Ganondorf for numerous reason, one of which being he wasn't sure if Ganondorf would appear in future Zelda games. Wonderful 101 did not do that well, and Splatoon is the start of a new IP. Maybe Splatoon would be considered, but Sakurai might look at it and go "ok, there's no guarantee this is going to be a success."
If Splatoon is successful, I can easily see Inklings being added in the next Smash Bros. game, but I doubt DLC would last long enough for this game for that situation to happen here. In the case of Shulk, Sakurai did state that they usually don't "add characters like this." I think that's the same situation. Xenoblade Chronicles X features a new case with no apparent returning characters at all, Shulk probably won't appear again in a new game. So him getting into Smash is basically an exception to the norm. Roy was also a similar case, while Ike and Marth are recurring FE characters.
Splatoon is on an iffy level for me. I think its possible. Wonder Red I find rather unlikely, Splatoon probably wins out here since its a new IP that has not been released yet and could be successful, while Wonderful 101 has released and was not successful.
4.) Although I do agree that Isaac looks EXTREMELY likely to me, I hate referring to him as a "shoe-in" or "near shoe-in." I called Isaac a shoe-in all throughout speculation and I should not have. I do think he's EXTREMELY likely, probably the most likely DLC candidate in my eyes, but I hate using the term "shoe-in" for anything. The only shoe-in is Mewtwo, since he's confirmed.
5.) Impa I think is definitely the next most important character in the Zelda series, probably the most likely Zelda character, but I don't think she's all that likely in general.
6.) Agreed fully on Captain Toad. I think Captain Toad is probably quite likely (especially due to that whole "I wish I could join the battle" thing), but I'd rather not have him because its yet more Mario representation.
7.) Fully agreed on Bandana Dee. Yes, he's the fourth-most important Kirby character, but he's still only a rising star, and just isn't as important as characters from other franchises. I honestly do believe we'd be more likely to get Dixie and K. Rool both than Bandana Dee, because Dixie and K. Rool as a whole are far more iconic characters in general and have been around longer. But obviously, that's my personal opinion. K. Rool is the DK main antagonist, Dixie had a starring role in her own game as well and has been a major recurring character. Bandana Dee doesn't quite fit that. I think he's possible, but I'd be salty about his inclusion over other characters who frankly should probably be in over him, really.
As for the last comment, nah, I don't think there's any character that's missing. Ideally I'd like to see Lip, but I find her extremely unlikely at this point. Which is sad, she's one of the most deserving characters. If anything I think there's too many on that list.
Fair points. I'll reply to each
1) Fair point
2) Fair point. If they were planned and didn't have complications, then I can see it. If they weren't even planned, I doubt it.
3) The thing is that there is nothing pointing toward The Wonderful 101 being a one game wonder. Kamiya has expressed interest in doing another game in the series, and the game itself had great reviews. Smash Bros. is one giant promotion, whether it is intended to be or not. Placing Wonder Red (who wouldn't even be a waste of a spot based on his moveset potential) in Smash Bros puts him, and the series he comes from, into a position where he's on center stage. Same thing with the Inklings and Splatoon. What better way to get a brand new IP some attention? Super Smash Bros. Now, I know that most people have the issue with them not even being released yet, but the exact same thing happened with Roy.
Now with Roy, I understand Fire Emblem was already an actual series. Regardless of whether or not Roy was chosen to promote a game, he still promoted the game. He didn't have any prior merit besides his abilities. It's essentially the same as the Inklings. They have immense potential.
The magic of Super Smash Bros., is that characters that have the privilege of starring in this all-star crossover enjoy a good amount of healthy exposure. Basically, if you look at how Fire Emblem rose in popularity post Melee, it's a very interesting relationship. It's now a more popular series for Nintendo. If it were truly a problem to have a character who hadn't appeared prior to Smash, Roy wouldn't have been included in the first place.
Now when we're talking about Splatoon, that game was met with quite a bit of hype. The potential of the Inkling is undeniable, and Sakurai has even said in an article that they were looking at games currently in development. Whether that means they looked at Splatoon isn't really something that can be proven, but I wouldn't necessarily rule it out of the question. To summarize, I think it's entirely possible that Inklings could happen, and they shouldn't be counted out simply because their game isn't out yet. (Also, I see that you mentioned something along the lines of "who knows if DLC will be happening when Splatoon releases?". It will be. Splatoon I'm pretty sure was scheduled for Spring or Summer of 2015, and based on how MK8 and Hyrule Warriors are going, I don't doubt Smash getting more DLC content.)
Anyway, back to Wonder Red. While I understand the argument that the game didn't sell well, sales aren't the biggest indicator of whether or not a character will be in Smash Bros. As an example, I usually look at Ike. Path of Radiance was the worst selling Fire Emblem, yet the lord starring in that game was given a slot. If sales were as large an indicator, then who knows if Ike would have been added? A lot of characters come down to what they can do, how they're different, and as you said the potential future of the series.
I think your example on Xenoblade and how Sakurai said that they, "normally don't add characters like this" is up to interpretation. When I first read that, I didn't even consider it the way you interpreted it. Not to say that any particular interpretation is correct or incorrect, but I'm not so sure that's what he meant.
4) I suppose it just depends on how someone looks at it, but saying he's a shoe in is probably overstating. I do think he's one of the more likely characters to be chosen though, if only because of his lack of appearances thus far.
5) Impa is basically next in line, but it all depends on if Sakurai looks toward Zelda. I don't think she's overly likely myself.
6) Yeah, I think Mario is doing fairly well with the amount of characters it has. I wouldn't necessarily mind the Cap'n, but I'd rather have other characters first.
7) Glad to see somebody agrees with me. I thought I was one of a few that held that opinion of Bandanna Dee.
Overall, I feel your views on my roster are fairly reasonable. I just view Wonder Red and Inklings differently.
(SORRY FOR THE WALL O' TEXT. MIGHT HAVE GOTTEN CARRIED AWAY)