1.) Average. Simple girls, nothing special about them, but also w/o any obvious bad characteristics. Might be worth hanging out with them. May become your girlfriend, some of them might become GOOD girlfriends.
2.) Attention / party whores. You know them, they're hilarious. If you wish you to hang out with them -- go on, but it's not really worth to go into relations with them. Would you like if your girl would post her boobs over internet just to get some guys attention?
3.) "Queens" who think whole world runs around them. Have extremely high self esteem, greedy, and are sure that guys simply MUST obey them and make them feel good. If anything goes not like they want, they begin to bitch heavily. It's funny to watch them (heck, free clowns!), but nothing more. Bad for friendship, even worse for relations.
4.) Shy girls. Most of them are damn cute and sexy :) Too bad it's hard to crack their "defenses". Experience shows that some of them are hiding sexual beast inside them, just unleash it ;) They can be good friends and if you broke their defenses, they might be very good and loyal girlfriends :)
5.) Extremely beautiful girls. They are sometimes very similar to "Queens". Chasing them is like competing for a gold trophy: you have a lot of different competitors, you must work very hard (spending cash on them, thinking about new ways how to spent a day etc) and if you get the 1st place, you might realize it's not really worth it. Might be a good friend, but as a girlfriend it's not the best choice: a lot of guys will want her, so there's a high chance that she'll cheat on you eventually.
6.) Lesbians. Are the same as average girls in terms of hanging out, but forget about sex with them.
7.) Intelligent girls. Not advised to fool around them, make hilarious actions and so on. For them good conversation or chess game is far more interesting. Pretty hard to get her as your girlfriend.
8.) Dominant girls. This is tough. They expect guy to be perfect gentleman and any bad move may result in break up any kind of relations. Very hard to win them over, however it's quite often really worth it.
9.) Well, no offense, but... ugly girls. They might be a good friends, but something more...