Mario
Mario is the greatest hero in the entire Mushroom Kingdom, a plumber who's traded in his wrenches for travel to the far-flung corners of the universe. In his latest adventure , Mario must chase his nemesis, Bowser, across the cosmos to rescue the fair Princess Peach. While soaring through the heavens, Mario encounters all the fantastical wonders of space, from strange comets to imaginative planets. He must also wrestle with one of the greatest forces in the universe: gravity. If Mario can use gravity to his advantage, he might stand a chance against the tricks and traps Bowser has left in his wake.
Luigi
Mario's brother who is rescued several times.
Bowser
The villain (again as always). He is a big reptile-like creature that kidnaps Princess Peach and tries to create his own galaxy to take over all the others.
Princess Peach
Bowser's prisoner (once again, as always). She has a pink dress and long blond hair. She is the princess of the mushroom kingdom.
Rosalina
This Keeper of the Comet Observatory floats through the cosmos with curious star creatures, called Lumas. Her past is shrouded in mystery.
Polari
This elderly Luma is Rosalina's most trusted advisor. He knows all about the observatory, and if you speak to him, he will show you a map.