Yeah but they’ve also been super wrong on Smash character predictions too. Notably Joker and Terry(?). They got some stuff but I don’t think they REALLY know who the Arms character is.
Good 'cuz I want it to be Spring Man.
This is probably a bad way of thinking, but I feel like Spring Man is the objectively correct choice for the ARMS character. It's not that I don't want the others (I'll take as many as they decide to make so long as their unique qualities are intact), but if there can only be one, I think that Spring Man is the best choice since even though he has quirks of his own, they don't require extra brain power to get the best use out of it, which allows players to focus on the ARMS; the main draw of the game the character is trying to represent.
If we get more characters as alternate costumes, I hope it's just Ribbon Girl and/or Springtron, as the former's abilities mixed with Spring Man's would make the character more well rounded in the platform fighter environment instead of just making it a mess like it would if you threw in Ninjara and Min Min, and the latter is just...robot Spring Man with no real distinguishable qualities of its own other than trading the comeback mechanic for something that wouldn't even work well in the context of Smash anyway due to its slow startup.
I don't want anyone else as alternate costumes of Spring Man because while I do agree that sharing a moveset would be perfectly fine, I don't agree with not having each character bring their own flair to it. Granted, the difference between the characters would be small, but they'd make a huge difference on how the character is played. And because these changes are small in nature and the character's archetype wouldn't change (they'd always be zoners), I hope that if they're going to make the alternate costumes, they'll go the extra mile and add their unique traits alongside them. Of course, alternate costumes shouldn't have different functionality, so instead of alternate costumes, have them be a custom slot like the Mii Fighters. They wouldn't have their own menu or anything, just pick the ARMS character, and then select which one you want like you would select which Mii you want.
At this point I'm just rambling, and my antics here are probably starting to get annoying. I should probably take a break 'till reveal time. Can't garuntee that' I'll do it, but that's probably what I should do.