I can imagine what he'd do with them after Dark Pit and Lucina.
who were last minute clones. Both characters have a lot of potential to be unique but there was no time to make thme unique. Lucina has almost as much potential as Chrom (although giving her some skills like Vantage or Pavise could start shipping wars and i'm not sure Sakurai would do that. She can't use the shield of seals, too and weapon switichng is less viable for her); there is a crapton of weapons skills and items in Kid Icarus Uprising for a moveset for Dark Pit. he could even have as much inspiration as Megaman or MGW had.
When i said what i said previously, i am obviously assuming Sakurai has TIME to make the magic happen. And on chrom's case, the lack of bias.
Smash never even ruined Rosalinas character. She's not mind controlling the Lumas or making them take the death blow for her. The Lumas want to fight alongside her and protect their mother figure. Lumas can't fight without help though so Rosalina gives them the power to do so. Also she did a lot to earn her spot in smash bros and she deserves to be here. She's one if the best newcomers here and this is the best way to make her the most unique.
It doesn't look that way to me. at the point that moving her wand moves the lumas and she can use them as meat shields after all, why not, she can just summon another.
There is little separating Rosalina's treatment of the Lumas from Olimar's treatment of his pikmin, and we lal know how that guy. Because it's the same thing.
Did a lot? really now.
She was a side character in SMg, was barely relevant in SMG2, and was playable in 3DW only after the main quest was over. She was not particularly important in any of the spin-offs she got in besides the 3DS Mario PArty (IIRC), and she was only in about 10 games total, maybe a bit more.
For a series as big as mario, that's not nearly enough to justify a smash bros spot for a Mario representative. Compare with the other newcomer we got, bowser Jr: Main villain twice, significant villain in 4 games (including SMGs, where he is more present than Rosalina), and was in about 40 or so spin-offs by now (and frequently is a relevant villain in those, especially Mario Baseball)