I never understood why people thought Rosalina could be a clone of Peach...
Because they are blonde royalty in dresses? Seriously?
If we actually compare their roles and Peach's moves to Rosalina's established abilities that makes no sense.
The ONLY similarity (JUST ONE) that the two share (regarding fighting) is the ability to float. Peach floats in Mario 2 and 3d World. Rosalina floats in SMG1, SMG2, and MKWii.
That's it, it ends there.
Rosalina has never touched a Toad.
Rosalina has never been in Mario Golf, so having a Golf Club would make 0 sense.
Rosalina has never been in Mario Tennis, so having a Tennis Racket would make 0 sense.
Rosalina with a frying pan? Really? Since when has she acted like the (negative) woman stereotype?
Rosalina spinning in a circle squealing "yes!" while a ribbon twirls around her? Did people actually think that was a possibility? It's probably a reference to ribbon dance game from Mario and Sonic Olympic Games, which Rosalina has never appeared in.
Rosalina swinging her hand up and a bunch of hearts flying around? That's never been her thing. She's not girly like that, and has never been asociated with hearts or love, unlike every other Mario female (human).
Rosalina swinging her butt, hurdling it forwards screaming "HA CHA!"???? WHO THOUGHT THIS WOULD HAPPEN? IF YOU DID... WHY.
Rosalina using turnips? Nope, she wasn't in Mario 2, which that is a reference to.
Rosalina using an umbrella/parasol? Nope, she's never touched one... never. Makes no sense to give her one now... that's Peach's thing.
Now lets go on to the float. Peach has a second jump as she holds her dress and floats in that position for a short period of time.
Whereas Rosalina commonly stays at a constant float at all times, and can float away by just jumping, she just keeps floating forever. It's like comparing Lucario's Aura to Mewtwo's. It's an aura. But it works differently, moves differently, takes different amounts of time to start, lasts different amounts of time, and has a different affect.
See the difference?
Whoever actually thought that Rosalina could possibly clone Peach AT ALL, I don't know what you were thinking. You must've really wanted no more Mario characters or a different Mario character to have ever said something as stupid as that. I didn't even go over how their roles as partner/helper/unlockable character differs from damsel/damsel/character from start. They've never played the same role in one game and share no moves.