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Wednesday & Pugsley Addams, The Addams Family
If you can look past pet spiders and a miniature guillotine, Wednesday and her brother, Pugsley, are quite charming. This mature older sister and lovable little brother could keep you safe from their mansion's many inhabitants, including Kitty Cat, the family lion, and Thing, the disembodied hand.
The creepiest part of spending the day with these macabre youngsters would be the presence of Cousin Itt and Uncle Fester. Come on, fellas...it's time to get your own place.