Voiced by: Kirsten Storms
Kim's classmate at Middleton High School and her rival in almost every respect. Bonnie has a dismissive and superior attitude towards Kim, Ron, and people in general, whom she considers to be beneath her. She has cultivated an ivory tower position at the top of the high school "food chain," a position challenged by Kim's leading of the cheer squad and general popularity. Bonnie previously dated the football team's quarterback, Brick Flagg, for the status bestowed by this relationship; she later dated Hirotaka and Señor Senior Junior. Bonnie has two older sisters that frequently pick on her, saying that Lonnie got the beauty and Connie got the brains, and Bonnie got the rest. In the episode Downhill from season 1, Bonnie's mom makes her first and only appearance. Bonnie is humiliated when her mom calls her "Pumpkin" and "Bon-Bon". Ron, however, is highly amused. In the end of the series, Bonnie is revealed to be the only senior in Kim's class who hasn't graduated (due to missing an important pop quiz the week before the graduation, thus leaving her one credit short) and being forced to go to summer school, much to her anger, although Señor Senior Junior cheers her up by saying he'll be there during summer school. Although she does not like to admit it, Kim and herself make a good team, using all of their knowledge in cheerleading moves to beat up stronger enemies than them. In the episode Bonding, for example, Kim and Bonnie got stuck together, forcing Kim to take Bonnie with her on a mission to face Professor Dementor. After being captured and later rescued, the two girls worked together and incapacitated Dementor with their acrobatics.
- In A Sitch in Time—Future Bonnie is voiced by Kelly Ripa.