Betty Quinlan is a supporting character from The Adventures of Jimmy Neutron: Boy Genius. She is a student at Lindbergh Elementary School whom Jimmy has a crush on for most of the series, though she does not seem to return the favor and seems to only be flattered by Jimmy's affections. As a result of Jimmy's crush on her, she and Cindy do not get along well. She enjoys performing in front of an audience. While Betty likes Jimmy and is flattered by his affections, she doesn't return his feelings and she knows he belongs with Cindy and is fully supportive of him and Cindy being together.
Betty is a pretty girl who is usually seen wearing a pink dress. She is relatively slim, with black hair, and white layers of clothing.
In an unmade episode that would've come in the show's fourth season, Betty, Cindy and Libby would get trapped in Jimmy's lab and would have to work together to escape. Cindy would've finally admitted why she resented Betty and the two would've finally become friends.