Annie is an adorable and very beautiful 4 year old girl, she is Leo's beloved little sister, Annie likes to sing, and she owns her own pink microphone with orange notes on it, she is great at making up songs and dancing. She owns a camera, and is the only Littlle Einstein apart from Leo that can fly Rocket and has in fact flown Rocket solo before. She has a pink fancy bedroom. Whenever she hugs Leo, she wraps her arms around his neck. Quincy sees a daisy sprouting out of her noodle.
Annie's love interest is Quincy, they both can sing, play, and dance, They look at each other when singing. They both sit next to each other most of the time when flying in Rocket. In The Birthday Balloons, Quincy gave Annie a balloon. After Annie thanked him, Quincy gave her a wink which made her giggle. They both also save the Little Einsteins and each other as seen in Season 1 episode Annie's Solo Mission and the Season 2 episode Quincy and the Instrument Dinosaurs. In The Christmas Wish, after Quincy played the drums to the toy soldiers beat, Annie thanked him and said that that very brave.
Annie wore a green shirt, a blue jeans dress and pinkish-purple sneakers in Season 1, in Season 2 she wore a light blue shirt with a pink dress and blue sneakers, she is blonde and has blue eyes. Her hair is pig-tailed tied in pink ribbons.