- "I hear he's been obsessed with her since 1986."
- ―Winnie telling her friends about Mr. Baldwin's crush on Ms. Lips[src]
Winnifred "Winnie" Grouper is a cheerleader at Freshwater High. She has a long ponytail, freckles, a blue bodysuit and a high-pitched voice that sounds like Snake. In the final episode "Fish Graduation", she graduated offscreen.
Winnie was one of Randy's customers when he produced his version of the Fridge Hat. She bought a "Better Fridge Hat", and when the "Better Fridge Hat Minis" were introduced, she was very excited. She ripped off the Better Fridge Hat, but one of the consequences of leaving it on too long was that the hair stuck to the bottom of it. Winnie screamed when she realized her hair was stuck to the Fridge Hat. She bought an Emergency Rainbow Afro of Love to cover her bald head. ("Milo's Big Idea")
She was dressed up as a peasant for the play. ("Fish School Musical")
She attended an emergency meeting with Tabitha to discuss who would be on that year's Freshwater Catch of the Month Dude Edition Calendar. ("Fish Flakes")
Winnie was dancing with her friends at prom. ("Fish Prom")