That makes me a creepy old guy! Yey! And I think Tan's list is more accurate, but I'd say the groups can be broken down into much more specific categories.
1. Sarcastic Jews that all the noobs think are cruel and evil but intelligent people find hilarious (in addition to cruel and evil.)
2. People who'll try their hardest to come up with new CYS factions for our amusement, but unfortunately they'll always pale in comparison to the mustache/mallet wars, and end up with the same two people arguing for 100 posts about cutlery and desserts.
3. The "Godwin's Law" provers who can turn any conversation into a serious and passionate debate about religion, philosophy and the concept that right and wrong do not exist, which makes murder A-OK. These conversations generally end with someone getting very angry and automatically losing the debate when they bring up Hitler or the Nazis.
4. Trolls that'll go out of their way to convince you they're not a troll, which only makes them look more like a troll.
5. Unfortunate new members that everybody is wary of because we've come to automatically suspect everybody new of being a troll.
6. Noobies who'll post in the forums asking for advice on their game, sending private messages asking people to proofread or co-author their game, let everyone know that they've finished their game and ask people what they think of it... And the game turns out to be five pages long.
7. Members that have migrated to another site, who'll pop in about once a week to take a look at what's going on, make a post or two, go back to their new troll-free site and mock us poor bastards at CYS that still have to put up with amateur trolls and kitty porn.
8. People with anime avatars that mostly blend in well with the rest of the community, but will occasionally confuse everyone by bringing up or making a reference to an anime show that nobody else have ever heard of. Sometimes they'll attempt to start a thread to talk about anime, only to find that while the site has quite a few anime fans, they all watch different shows that none of the others have seen, leaving them with nothing to talk about.
9. Endmaster stalkers.
10. Admids and mods that'll disappear for months or years at a time, come back to look through the forums for five minutes, leave traumatized and cry themselves to sleep at night when they see what's become of their beautiful community. 
