Which is funny, because all three of those examples can be attributed to Nintendo in some way regardless. Even if one tries to link them exclusively to Sony fame, Sony itself has past ties with Nintendo. By proxy, all things gaming (including Microsoft) lends some history with Nintendo. That OP's argument is a flop on that basis alone. Putting that aside, I hate pedantic bull**** like that.
I think a certain two image boards are great for looking up art of a character you like. The one I'm thinking about, but can't see here has a pretty good quality filter, and there's a SFW version too (though you still might want an account on that one to filter out tags you don't want).
I don't want to get my hopes up, but I genuinely hope for more ballpark announcements from Capcom. They're on a roll so far, and I don't want the detractors to be right about them being on a miraculous fluke with their recent titles. That would also be an opportune moment to announce that Xenosaga Trilogy remaster that was rumored to be a thing (...provided the demand is there...). Sony was a whole lot of nothing in the last few years anyway, so I think Nintendo and Microsoft can potentially carry their presentations all the way through if they have stuff to work with. Here's to hoping!
I would like more stage builder content, like additional backgrounds, a texture pack, QoL options (i.e. eraser tool letting you erase parts instead of whole shapes, a copy/paste mechanic, small pieces NOT taking up a metric-ton of real-estate for whatever reason, etc.). Oh, new gimmicky tools to play with including past ones would be nice. Maybe even a target and platform tool so people can create their own break the targets and board the platform challenges as a bonus.
The only other characters besides Erdrick that I think would have a huge presence in Japan as announcements are Reimu and Artoria, easily. As far as world-wide appeal goes, I think we've reached a point where all the heavy hitters sans deconfirmed characters are already in the roster. Never mind the fact that a lot of casual players who own Smash themselves probably got the game because they saw Mario and Pikachu on the cover, and all the other "weird characters" thrown in. DLC, as obscure as it can possibly get while remaining undiluted fanservice, isn't obligated to try to reach out to all crowds around the world at once.