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Harold is a balloon imaginary friend that first appeared in Store Wars.
Harold is a walking blue balloon with big white eyes. The mouth of the balloon appropriately serves as his own mouth.
Harold appears at the very beginning of Store Wars, when all of the imaginary friends were decorating the house to for Madame Foster's birthday party. Harold blew up a balloon, and in the process deflated himself. Wilt thanked him for his help. Harold appears again in Read 'Em and Weep as one of the recently adopted friends that Bloppy Pants rescued and brought back to Foster's.