Heidi is a broken fire hydrant in the episode "Lost in Bikini Bottom," named by SpongeBob.
It is a red broken fire hydrant that SpongeBob personified to be female.
Heidi was seen when SpongeBob got lost. She was used as a landmark for SpongeBob to try and find his way to the Krusty Krab.
|| I can turn into a skyscraper!
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|| "Octavius Rex, a.k.a. long, tan, and handsome!"