I think it was a joke, but I might be wrong! In any case I'll comment the rest in spoiler.
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Let's take a look at it;
Number one is accurate as it's confirmed lol. How they will handle the ARMS representation is unknown thus far, but I believe it will be a hero situation as well. That there will be perhaps a mix of Spring-Man, Ribbon Girl, Min-Min and Dr. Coyle? Idk, something along the lines of borrowing moves from each other as ARMS is about customization in an of it's own. Just depends on the model of the
2 - Rex, Sora or Lloyd Irving? Well, it seems like anime swordsman is the key of this. Rex would make sense, he was mentioned bing a desire of Sakurai at the time, but it was too late for the developement, but Fire Emblem proved this to be the case of a chance. He is first party and would make a second Xenoblade character. Makes sense. ... Sora would be lisencing hell, but no doubt a bomb of hype and fanservice, if anyone can it's going to be Sakurai. ... Lloyd? Could also work since Bamco is creating the game alongside Sora Ltd. I guess he is the most recognizable Tales figure. Could be fun. Idk.
3 - Pinocchio boy! The ultimate crossover of Disney and Dream Works, it's such a fairytale and no wonder he is that must reque-- OH GENO. Jokes aside, Geno would be pretty dope, mainly just to finally finish the wagon of requests. Also it's a character that is dear to Sakurai's heart, talking about how he has a huge interest for the character in game, and with both FF and DQ being repped already I guess it's a bit easier. Give our amazing director his favourite toy.
4 - Doubt a Rhythm Heaven rep would come out, but hell would I love it. I love the RH series and think it deserves a playable, but the decision of who would be a bit tricky, and of course how they would create the moves based on rhythm. Would be interesting.
5 - Uhm. No idea what that's suppose to mean, but a Pokémon or Kid Icarus rep? Kirby or Fire Emblem rep? Well ... We can be assured there won't be any Fire Emblems anymore, Sakurai is fed up, and he was quite hesitant about adding Byleth and thought even Corrin was a bit too much at the time, but of course the company, pluss Nintendo had to do it (Byleth is badass tho, but even I was irritated by the choice at first). - - - A new Pokémon character could make sense, it's second party, huge franchise and quite relevant, there are a lot of characters to pick from, and maybe no surprise. Kid Icarus? Hades, Viridi or Medusa? Yeah, could happen, but doubt it. Kirby? Bandana Dee would be perfect, but I also doubt it.
6 - Crash Bandicoot? Now, I'm going to be biased and say, this is my dream pick. Crash is my most wanted DLC fighter, it was in wave one, and even more in wave 2. Would love for this to happen, and I think there are legit reason to believe Sakurai would and could pull it off. Only time will tell.