Rosalina was one of my favorite characters when she first came out. She was a princess with a mystery. It's odd, the character with the mystery is the most fleshed out character in the whole entire Mario series. They should have left it that way.
With all these new games coming out with Rosalina in them, I just feel like shes not special anymore. We don't go any deeper into her past, which was one of my favorite parts of Super Mario Galaxy. I feel like shes a new Daisy. A princess meant to be in one game. Then Nintendo decides, lets add her to this, lets add her to that. I'm sure we'll get some sort of "Hi I'm Rosalina!" in the near future.
What do you think? I'd love to know!