Tooty is Banjo's younger sister and Bottles' best friend. She wears pigtails on her blond hair and her ears aren't seen. Her only outfit is a red tank top with a yellow star on it and purple slacks that strap her feet. In Banjo-Kazooie, Gruntilda kidnaps her because she wishes to steal Tooty's perceived beauty. Towards the end of the same game, she spends her adventurous time with her big brother and friends while eating the inside of a coconut. She is physically absent from all other games in the series; In Banjo-Tooie an image of Tooty is shown on the side of a milk carton with the caption Missing: Last Seen In Banjo-Kazooie. Also in the same game, inside Banjo's house, her portrait is shown to be down with the other things that have burnt a little. Her name is also referenced in Banjo-Kazooie: Nuts & Bolts as a shop in Showdown Town called Tooty Fruity, and her absence from the series is also referenced in one of L.O.G.'s quiz questions. She plays the piccolo.
Source: Wikipedia, "Banjo-Kazooie (series)", available under the CC-BY-SA License.