Shark:
These tight, passive-aggressive players usually start with premium hands and will play aggressively when something hits. These are the most successful players overall, and you are generally better off trying to target weaker players unless you have a quality hand. Most of your profits are going to come from other player types.
Mouse:
Characterized by playing extremely tight and passive, the mouse only plays premium starting hands and will easily fold if nothing hits on the flop. These players are rarely in hands, and are usually ahead if they continue. If you can come across as a tight player to the mouse, they will usually run away from your bets even when they are winning.
Calling Station:
This is the category that most novice players fall into. They will limp into pots with a myriad of starting hands without considering pot odds. These players will often call bets to chase hands with only a few outs, or just to see if you are bluffing. Calling Stations are the biggest losers on average
Calling stations affect the table by distorting pot odds for drawing hands. By staying in hands too long, it often puts the odds in your favor for flush and open-ended straight draws.
Maniac:
The maniac is exactly that - crazy. Raising disproportionately and often, the maniac intimidates other players becoming passive with his aggressive play. Eventually, players will tire of the maniac’s outrageous betting and adjust their game to be looser and more aggressive.
Be patient with the maniac, you want to wait for the one hand to take them all in. Do not bother bluffing or trying to engage frequently to the maniac; give up the small pots and let him think he can continue you pushing you around...until you can feed him some nuts!
Rock:
These players are similar to the mouse in that they have little effect on the table. Unlike the mouse, they will be aggressive when they hit a hand. It's difficult to get chips from these types of players, you can steal pots from them due to their selective nature for starting hands but otherwise leave them be and pick on the weak players.
Aggressive-Aggressive:
A good aggressive player is betting, raising, and thus taking control of the pot. These players, however, take this too far. They play the sharks game, but are not selective enough with their hands. Try and take advantage of their overaggressive nature and set them up. Check raise them more often since they're going to bet your hand for you.
Aggressive-Passive:
Similar to the passive-passive players(below), the red fish are among our favorite opponents. They are known to take a stab at pots early without premium hands. When you stay in the pot with them, or bet back into them they often wilt. Seek these players out, and enjoy!
Passive-Aggressive:
Watch out for these players. They will limp into a lot of pots, and tend to trap you on the turn and/or river. You can make money off of these players, but be careful when they call more than one bet.
Passive-Passive:
These greenfish are the biggest part of your poker-player-eating diet. They have the playing style of the mouse, but see more flops. They will limp into pots, and run away from your bets! These are the players you want to sit with... if you like winning, that is.