Dumb Muscle: In some incarnations, Lurch is not very bright. One episode of the 1960's show even had Wednesday mention that Lurch doesn't know how to count.
Frankenstein's Monster: He has the appearance of one, to say the least, but some continuities make jokes implying that he is made from dead body parts, was brought to life in a lab, and/or was created by a mad scientist.
Gentle Giant: While physically intimidating, Lurch is a very nice guy.
The Un-Smile: Again, in the second movie, this is a warning sign.
When She Smiles: There are moments where it appears genuine, it just doesn't help much that she seems to show it mostly for sadistic and twisted reasons.
Younger than They Look: She is younger than her brother Pugsley in the 90's cartoon despite being taller and more intelligent.
Adaptation Dye-Job: He was blond in the original New Yorker comics, had dark hair in the 1960's show, was made blond again in the 1970's cartoon, had brown hair in the live-action films, was blond once more in the 90's cartoon, and had brown hair once more in The New Addams Family.
The Dog Bites Back: While Pugsley had to put up with Wednesday torturing him most of the time in The New Addams Family, he eventually had his revenge by trapping Wednesday and her identical cousin Monday Jones inside a trunk in the episode "Keeping Up with the Joneses".
Retcon: Throughout the franchise, Fester's relation to the family varied. While it wasn't made clear in the original New Yorker strips by Charles Addams how he was related to the family, he was made Morticia's uncle in the 1960's television show. After that, he was made Gomez's brother in the 70's animated series, then back to Morticia's uncle in the 1977 special Halloween with the Addams Family, and was permanently made Gomez's brother again in the live-action movies, the 90's animated series, and The New Addams Family.
Composite Character: A rather complicated case. In the original 1960's show, Granny was Gomez's mother with Morticia's mother being a separate character. Grandmama would remain the standard grandparent in later adaptations, but it would vary whether she is Gomez's mother or Morticia's mother and she would rarely coexist with Morticia or Gomez's mother as two separate characters. The 2010 musical mercilessly lampshades the issue by revealing that Gomez and Morticia are both uncertain whose mother she is.
Retcon: Whether she's Gomez's mother or Morticia's mother is never consistent. She started out as Gomez's mother with Morticia's mother existing as a separate character, but was made to Morticia's mother in the 70's cartoon. She went back to being Gomez's mother in the 1977 special Halloween with the New Addams Family, once again coexisting with Morticia's mother. After that, she became Morticia's mother again for the live-action films and the 90's cartoon and went back to being Gomez's mother in The New Addams Family. The inconsistency was mocked in the 2010 musical when Gomez and Morticia were revealed to both be unsure who's mother Grandmama was.
Blinding Bangs: He is a most extreme case, being covered in hair from head to toe. Some continuities even imply that he's nothing but hair.
Demoted to Extra/Ascended Extra: He only showed up in three episodes of the 70's cartoon albeit appearing in the opening, but episodes that don't feature him are scarce in the 90's cartoon.
In Name Only: In the original New Yorker comics, Thing was a complete person only partially seen who often appeared in strips as a hidden Easter Egg spying on the family. All other incarnations made Thing a disembodied hand, though some New Yorker strips of the family did feature a hand reaching from some sort of opening (e.g., a pipe or a sea shell).
Awful Wedded Life: One-half of the couple mentioned under Tully's entry. Eventually, she leaves him for Cousin Itt.
Margaret: Why did I marry you? Tully: Because I said yes!
Human Mom Non Human Dad: Well, whether or not Cousin Itt's actually human is debatable, but the fact is that he and Margaret managed to conceived a child together — "What", named by the obstetrician.
Morticia: Isn't he precious? Margaret: We've had offers.
Running Gag: In the first movie, she manages to trick herself into Fester's "Chinese finger torture trap" gag device more than once. She's even chosen to model it at the charity auction for this reason.
The Dog Bites Back: His father Walter Adams frees the Addams Family for his attempts to poison him. In addition, the film ends with the doctor being electrocuted by mental patients he had tortured with electric shocks.
Light Is Not Good: In contrast to the Addams Family being benevolent despite their bizarre and macabre ways, the members of the Adams family look normal but are all Jerkasses.
Hypocritical Humor: Norman Normanmeyer and his wife Normina both despise the Addamses for being weird, when they themselves have a very unhealthy obsession with underwear.
Jerk with a Heart of Gold: They may have a rather prejudice attitude towards the Addamses, but always reluctantly thank them for their good deeds and they actually care about their son despite being friends with Wednesday and Pugsley.