I want Ninten, Paula, and Poo available as alts for Ness. That would be nice.
I suppose they could make Paula her own character, but she would be a second semi clone. Which is cool. They did it with Fox, Falco, and Wolf and I feel like that worked out well.
Jeff is my favorite party member in Earthbound and his moveset would be more unique compared to Paula's, but I know that he's not as popular and a female or villain rep should be next.
Pokey is in Mother 3 right? Honestly he would be a deserving rep. He was a recurring antagonist throughout Earthbound, and I've heard he has a part in Mother 3. His moveset would also end up being quite unique considering he would fight in a robot. But considering he was a boss last game, it's unlikely they would add him as a character.
There are no other significant antaonists in Earthbound apart from the Mani Mani statue and Gigyas, but neither of those would work. The Masked Man would probably be a cool rep. Probably another semi clone maybe. But I'm not too familiar with which psi abilities he has. Not that that has mattered so far.
Actually what would be a cool idea would be to introduce Paula and Kumatora as one single rep, and have different alts. Then you could have the female companion of both Ness and Lucas. I think that would be cool.
But the Mother series really isn't deserving of any more reps. They haven't had a game in ages and they weren't that successful. Metroid, Star Fox, and Donkey Kong would all be more deserving of reps.
Here's a question. Would you rather they develop a Mother 4, or do you want them to remake all 3 Mother games that create one cohesive experience and they can give a face lift to the game. I'm not just talking about a visual improvement, but also fixing menus and UI, and improving the combat system and readability. I think it would be really nice if all 3 Mother games were as a whole more accessible, and easier to transition between. I know that Mother 1 especially is difficult to play nowadays.
I thought Earthbound aged well, but my friends who watched me played the game thought that it was pretty dated. One even was surprised I had been playing it for so long. I think the games could be remade to be more accessible. But that's just me. It would be really cool seeing a remaster of all 3.
Though a new Mother game would be really cool too. It's likely one or the other would have to happen for a new Mother rep to be added in the next smash game.
Also I'm not sure if you all saw, but an artist on deviant art was inspired by card captor Sakura and made cards for each Smash character. It's easy to find them if you google them. I love Ness's but I can't post it here cause I'm on mobile right now.