Scarlette is a character from Paper Mario: The Thousand-Year Door.
Scarlette is Admiral Bobbery's deceased wife and they lived in Rogueport. In events before the game, Bobbery went out to sea and she became ill. Without Bobbery being there to help her, she died. She was the reason Bobbery didn't want to navigate Mario and the rest of Flavio's crew to Keelhaul Key, because he blamed himself for her death. With that, the heroes had to consult the bartender in Rogueport to get a letter from her, reading Bobbery shouldn't blame himself if she were to die. With that, Mario brought the letter to Bobbery, and he brought Mario and the rest of the crew to Keelhaul Key.