Timberly is Gerald and Jamie O's little sister. Jamie O is nice to Timberly more than his brother Gerald, whom he usually bullies. Her innocent actions often cause Gerald to get in trouble. She is voiced by Avriel Epps.
Different from all of the other children in the show, Timberly seems to be the only character who ages across seasons. In her first appearance, it was said that she is four years old, but in later seasons she is already in the first grade.
- Chocolate Turtles
- Cool Party
- Gerald Comes Over (first appearance)
- Gerald Moves Out
- Gerald vs. Jamie O
- The High Life
- Timberly Loves Arnold
- Love and Cheese
- Stinky's Pumpkin
- Hey Arnold!: The Jungle Movie
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