Both tags exist here with numerous posts but the Princess tag is incorrect as Rosalina is not a princess.

Should be other way around, plus there's already an open alias for it.

Super Mario Galaxy manual:
"Not much is known about Rosalina, the lonely princess who wanders the cosmos in the Comet Observatory, a giant starship that travels the celestial expanse."

Well, MatPat determined that Princess Rosalina is the daughter of Princes Peach and Mario Luigi.

Officially, what is known about her, is that her mother is dead and was buried under a tree on a hill, her father had facial hair, she's been living hundreds of years in the Comet Observatory, and her brother has a green cap. She is considered the Mother of the Luma, and similar to Princess Peach, has some form of magic, which while useful, is not the sort to overpower villains on its own.

Genjar said:
"Not much is known about Rosalina, the lonely princess who wanders the cosmos in the Comet Observatory, a giant starship that travels the celestial expanse."

Added that to the wiki for no reason in particular.

https://www.google.com/url?sa=t&source=web&cd=1&ved=0CB0QFjAA&url=http%3A%2F%2Fwww.nintendo.com%2Fconsumer%2Fgameslist%2Fmanuals%2FWii_Super_Mario_Galaxy.pdf&rct=j&q=mario%20galaxy%20manual&ei=xPKBVOWGJ8aZNreOgYAC&usg=AFQjCNHAIdek7JEj1BINfpB6DbpBhVH5Rg&sig2=JYlhdVDsiIEjcArOMzt-Ig&bvm=bv.80642063,d.eXY

Genjar said:
Should be other way around, plus there's already an open alias for it.

Super Mario Galaxy manual:
"Not much is known about Rosalina, the lonely princess who wanders the cosmos in the Comet Observatory, a giant starship that travels the celestial expanse."

The Super Mario Galaxy Manual reads
"This keeper of the Comet observatory floats through the cosmos with curious star creatures called lumas. Her past is shrouded in mystery."

If anything Rosalina is a steward for the lumas with limited gravitational abilities.

Rosalina is an oft used name. Perhaps not common, but not particularly rare either. If you say Rosalina, it could refer to many different people/characters, but if you say Pincess Rosalina almost everyone knows you mean the one from super Mario galaxy.

+1 for implication of Rosalina to Princess_Rosalina

Ko-san said:
The Super Mario Galaxy Manual reads
"This keeper of the Comet observatory floats through the cosmos with curious star creatures called lumas. Her past is shrouded in mystery."

Yeah, I got it mixed up. It's her bio (and trading cards) that label her as a princess.

In any case, Nintendo has called her a princess at least a couple of times. So it's no wonder that she's tagged as such. Definitely should be aliased, though I don't really care which way around.