In brawl, who would've liked her? Her symbol would be something other than the M maybe to change it up.

Hm, let me think about this question carefully...
No!!

Absolutely not. Nintendo shouldn't over-do it with rosalina, and she is not cut out to be a fighter anyway.

They would probably have made her a variant clone of Peach.

you guys are taking rosalina too far one series she will be in is mario kart mario party mabey but nothing else...

I agree totally with all the 4 comments above me.

She's just not important enough to deserve a place on the roster. And probably would be a clone of Peach.

She's right on par with Daisy. She has only appeared in one game.

I'll list Mario characters that deserve it over her (not saying they all deserve it, they just deserve it over her.):
Toad
Bowser Jr.
Paper Mario
Birdo

and there's probably a few others I forgot to mention.

I don't think she should be in Brawl. It would be stupid

Toad's already in the game (press B when using Peach).

She's like the least important Mario character ever. Even Goomba makes more sense. She doesn't even have moves.