Her Personality:

In Super Mario Galaxy and Super Mario Galaxy 2, Rosalina is depicted as a generally wise, kind, and mature character. She has an intimate knowledge of the universe and cares deeply for the Lumas and her friends, to the point of assuming the role of total caregiver and mother figure for the former. Her outward strength and inner sorrow, as shown in her storybook, are likely due to the loss of her own mother. Rosalina is a calm and reserved character, and often takes pauses when she explains how the universe works. It has also been shown that Rosalina's voice is rather monotone, even when she is excited. Prior to Super Mario 3D World, her voice also has a reverberating effect.

Since Mario Kart Wii, however, Rosalina has been portrayed as a little bit more upbeat and joyous than her original stoic portrayal, with examples being that Rosalina cheers and shouts louder, though still mostly keeping her introverted nature. Like most players, Rosalina enjoys special activities, but in a more humble manner, such as when she simply waves to the audience upon scoring a point in the Mario Tennis series. Since Super Mario 3D World, Rosalina has also displayed more energy in her actions, such as when celebrating after reaching the flagpole in said game.

When Rosalina was young, she was portrayed as optimistic and proactive, helping a Luma build a spaceship to find the Luma's mother. Even so, she developed feelings of homesickness and melancholy, to the point of crying about losing her mother, though her spirits were raised easily when the Lumas impressed her with comets and an offer to take her back to her home planet.

Powers and abilities

Rosalina creates a protective bubble around herself to defend against attacks.

Rosalina has special powers as seen in Super Mario Galaxy. For example, once sufficient power is restored to the Comet Observatory, Rosalina is able to use her powers to surround the observatory in a force field, transforming it into a starship as a form of transportation. Also, she can be protected by a force field that resembles a bubble. If the player attempts to jump on her, the bubble appears. Rosalina can also form similar bubbles around Mario if he falls off the Comet Observatory; it then levitates and drops him back to where he was standing. Rosalina also has the ability to float, just like the Lumas, and at the end of Super Mario Galaxy is shown flying when she departs from the Gateway Galaxy's first planet. She has the ability to speak via telepathy, as shown in the end of the game, where she speaks to Mario, Peach and Bowser while she's far in space.

Rosalina is shown to be skilled with her wand, and can deflect Star Bits with it if the player shoots them at her. Rosalina has also shown the ability to teleport, at least from Earth to space. She can also use the spin move from the Super Mario Galaxy games, as seen in Super Mario 3D World, and can still create a shield to protect her if the player attempts to attack her as a non-playable character. She is also able to create giant hologram-like projections of herself, like in Super Mario Galaxy 2, and even change her height, like in Super Mario Galaxy. She also shows more of her powers in the spin-offs games, such as telekinesis, creation of shooting star showers, gravity manipulation, teleportation of other people, and the creation of Launch Stars.

Even ignoring her powers, Super Mario 3D World and the various spin-offs show Rosalina to possess a lot of human skills. She has proven herself to be about as athletic as Mario when it comes to both platforming and playing sports, with a jump nearly as high as Luigi, although she is noted to be rather slow on her feet (even more so than Peach). Half of her sports appearances depict her as a Power-type, hinting at impressive strength, and she is adept at driving karts as well. In addition, she is shown to be able to use any and all power-ups that the Mario Bros. can.

Try To Sound Exactly Like Her From The Games.

Ref: https://www.youtube.com/watch?v=IhEHDzxM68E&t=5s