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Fester Addams is the brother of Gomez Addams and the brother-in-law of Morticia Addams. He’s also the uncle of Wednesday Addams and Pugsley Addams and later Pubert Addams and the widower of Debbie Jellinsky. Fester seems to have the ability to generate electricity as shown by putting a lightbulb in his mouth and it lighting up. He is tradionally seen with a heavy black coat. He is shown like all the others to have a dark sense of humor and deep love for his family.
Uncle Fester is a completely bald, hunched, and barrel-shaped man with dark, sunken eyes and often a deranged smile. He always wears a heavy, full-length fur coat.
Despite Uncle Fester's menacing look and strange behavior, he is actually gentle and caring to everyone. He shows great respect to Gomez and Morticia. He has always exhibited love and great care to his niece and nephews, despite their frequent mischief.
- Originally he wasn't Gomez's brother but Morticia's uncle according to the first TV Series however this has since changed.