Annie is the main character of BrainPOP Jr, along with Moby. She and Tim are the only people who can understand Moby, along with Ben. Annie has a sister named Mia who talks on the phone too much. Her best friend is Becca and she is in Mr.P.'s class.It has been strongly hinted that Annie is Mexican as her dog's name is Sr. Maurices and she sometimes refers to her father as "Papi".
Annie is allergic to eggs and when she is angry, her face gets red and puffy.
She has a dark skin tone and has her black hair in pigtails. She wears red glasses, a yellow T-shirt with blue sleeves and jean shorts with sneakers. She loves to wear a red choker around her neck.
Her best friend is Moby and Tim. She also appeared in the BrainPOP movie Bill Clinton and her name is seen on a talent show schedule in a BrainPOP ESL episode. She also appears in the "Fun on the 4th" movie in BrainPOP ESL.