Definitely the Addams Family, for me.
As a little kid I loved all of the “Crazy Dad” type stuff that Gomez was always doing… grabbing his wife and kissing her when she spoke French; getting all buggy-eyed watching the ticker tape coming off of his home stock market thingie; stalking around waving a cigar like Gothic Groucho; paying for everything by pulling wads of crumpled cash from his pockets, causing heinous train wrecks with his model set, etc.
As a “Crazy Mom”, Morticia was right up there, too: cutting the blossoms off of her roses and putting the thorns in a vase; asking “Do you mind if I smoke?” and then literally smoldering like she was on fire; doing a little SM bit with Gomez with the dental equipment (she’d go at him with a drill and he’d groove on it “Ah, Tish! Excellent! You hit a nerve!”).
Grammama rocked… who wouldn’t want a practicing witch for a grandmother?? And she carried herself really well. I mean, she may have had funky wrinkled clothes and messy hair, but I bet she was Deb of the Year in like 1905 or something. Uncle Fester was just giggly and weird enough to be a bit scary, but he was so cheerful all the time it was hard to be scared of him for too long. The fact that he could make lightbulbs light up by putting them in his mouth was just the coolest thing to me, too.
Lurch of course was awesome. How cool to have a guy working for you who could also play the harpsichord. The kids were okay, but I don’t remember too many episodes where they really stood out. In a way, the way the kids’ roles were treated appealed to me as a kid, because I could really relate to being seen and not heard, and using that relative domestic anonymity to do some really fun stuff when nobody was looking. (Of course, I never got to blow stuff up.) Cousin It was just sort of part of the weird background, but at least he looked kind of scary, so that was okay. I also loved the fact that only the family could understand him. The only character who didn’t do a whole lot for me was Thing. Not sure why.
Later on my dad turned me on to the old New Yorker Addams Family cartoons, and they were fabulous. Classic, tasty, macabre, and really funny. Charles Addams and James Thurber, incidentally, were two of the reasons I ended up as a cartoonist at a local newpaper for brief time.