Fifi is a fictional character in the Hey Arnold! TV Series.
She lives in the same town as Arnie and is the counterpart of Phoebe Heyerdahl. However, Fifi's tall, lanky physical appearance also bears some resemblance to that of Stinky Peterson, as does her somewhat simple-minded personality.
In her minor appearance in the episode, Fifi is seen wearing a blue one-piece swimsuit.
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