Nice! Reminded me I haven't done one with DLC, though it's mainly because I don't like speculating about DLC given there's so many unknowns--who's in the base, what it's structure would be, how long we can expect it to continue (and the remote possibility there isn't any). Here's my expectations/wishlist:
I feel like there will be more third party characters as DLC than first party, but I tried to make them even (it was, until I realized I forgot to add Isabelle) and it got most of the main characters I'm concerned about, as well as one character per third party (I'd give Konami one, but Bomberman's an assist--and I decided to try no assists for this one). I also think if echoes are DLC, they'll either be free
(to Nintendo online subscribers) or very cheap, and so I don't see third party echoes being a thing.
There are other characters I feel are likely, such as Travis Touchdown as our first Indie rep and a Felix echo for Isaac. Got close to 100 (98-ish depending on how you count it), but my perfectionism got the best of me. Order doesn't matter, and the colors are green confirmed, yellow base, red DLC. Also much more DLC than might be realistic, but my hope is that Smash DLC continues for many years as possible (which also makes it difficult to guess what will be popular two years from now). Can't really fathom what a follow up could do to top Ultimate.