Flibberty Gibbet is a dolphin who is an old friend of Karen, Sandy, and Mrs. Puff. She is voiced by Sirena Irwin and first appears in the episode "A Cabin in the Kelp."
She is a graphite bottlenose dolphin with a violet dorsal fin and matching tail. She has a small beak and one eye on each side of her head. She wears a bright pink coat with pockets, a bright dark collar with a matching skirt and pockets, and light pink ruffles. She carries a white purse over her shoulder.
Despite the stories that Karen, Sandy, and Mrs. Puff tell about her, Flibberty has a happy and good-natured personality.