Have some ammusing article from WoWWiki
Incorrigible Personality Types
Most of this Guide is obviously geared towards Pickup groups or Guilds that haven't yet established Raiding parties. If you're in a group that already works, you probably don't need this Guide. But what if you're in a group that doesn't work, and there doesn't seem to be a way to fix it?
There are basic "incorrigible" personality types that will destroy any group.
The Accidental Aggro-Master (Affectionately referred to as 'Leeroy')
This is the guy who's always running off from the main group, pulling Adds on the group from every direction. Sometimes enjoys "Getting into position" -- his position of course being distantly beyond the pulled group of mobs, where he may aggro the two or three behind it, not to mention patrols.
The Family Outfitter
This guy whines for every single piece of equipment, because "he has a brother who needs it." Close relative and possible alibi of the Loot-Hogging Farmer.
The Commander in Chief
He knows the best way to do everything, and demands you do it as such. You can tell him apart from the group because he's always staring at the wall while he types a novel on how to pull the first mob of RFC in /party. He's also the same kind of player that would assign DKP and Master Loot green items in Deadmines. Thinks that every instance is an epic 40 man raid, and must be completed with perfection, speed, and professionalism. This person assumes command even if he is not the party leader.
The Rambo
This type of player has an irresistible urge to go and kill mobs, and believes in his god-given invincibility. After each kill, he immediately goes off in search of the next one, not caring what the rest of their party is doing. Usually results in his death and party wipe, and is almost always followed by "Where was my heal?"
The Secret Agent
Periodically announces "BRB" and disappears for a few minutes at a time. Often makes up for his absence on his return by running headfirst into the next mob without warning the party, or rolling Need on the boss's Bind on Pickup loot.
The Priest Whiner
As soon as he does not get a heal, he begins shouting at the party's priest. They always seem to have a lvl 60 priest somewhere in their pocket, even if their current character is their "main" and almost always a warrior or a rouge. Does not understand the concept of healing or mana. Identifiable if qouted with "I got a lvl 60 priest, i know better then you STFU N00B WANKER" but does not know what "Shadow Priest" or "Holy Priest" is. Treats Priests as NPCs.
The Lone Wolf
You never even know who this guy is, because his locator dot is always half a zone away. Either spouts unfufilled promises "I'm coming! Really I am! Oops, got ganked again..." or worse, never says a word in response to repeated queries.
Speed Racer
The inevitable member who runs at top speed towards every chest, Quest device, or shiny object in the Instance, usually resulting in Adds, a scattered group, and a Wipe.
The Jackass
The guy that complains about everything. He's usually a Warrior complaining that the Mage is "rolling on all the Cloth items" or a Rogue complaining when the Warlock doesn't rez him.
The Habitual Disenchanter
He will beg for every magic item after the roll in order to disenchant it. Does not understand the concept of money. Not to be confused with the Loot-Hogging Farmer, who will beg for every magic item or habitually roll need because he understands the concept of money all too well.
PVP addict
If a player of the other faction is near with PVP on, this person cant help but attack him, Even if he is 20 levels higher or Lower. Ganking will always result in "He attacked me first!"
The Loot-Hogging Chinese Gold Farmer
He will roll need on EVERYTHING, and is usually quoted with "I NEED OK?
?" only for the offended party to see this exact same loot overpriced on the AH an hour later. Boot him and ask cross-faction over IRC or Vent for this player to be placed on KOS.
The n00b
He is the guy that aggros everything, can't speak the same language as the rest of the group, doesnt know how to play his class, goes AFK every 5 minutes and Needs on stuff he cant even use BoP or not and says its for "his brother's son in law's mage on a different server."
The Ninja
This jerk is related to the Speed Racer, but also will roll on every BOP (Bind on Pickup) item whether he can use it or not, AND will grab every chest/item he can. There have been instances that this type has waited till everyone else has passed on an item, then picked it up and hearthed home. These types deserve KOS.
The ubern00b
Usually has a stupid name (such as Cloudxkillzorg or Destroyerxx or Tehultimateownzorage or Killerxomg) repeatedly opens sentances with "OMFG" always in caps lock. will always call everyone else "n00b" and always say "STFU" (typical sentance will consist of "OMFG STFU n00b I OWNz0r YOU OMFG)
Boost wanter
The guy who always wants a boost for an instance he is 10 levels too low for and threatens to "Haxx0r your comp" if you don't.
The Silent Player
Asks to join the group, but this is the last thing this player ever types. Seems to think they are playing a solo game. Follows their own rules, never says a word. Never notices the repeated pleas to stop for a rest scrolling past on their screen. Different from the Lone Wolf because he seems to realize he needs to stay near the party, and often ends up being similar to The Loot-Hogging Chinese Gold Farmer.
The n00binator
This is the person who combines everything above. He will deliberately Aggro every mob in the instance, open up every sentance with "OMFG" need on things he doesn't need, go AFK all the time, and always laugh at you when you die. He is ALWAYS a rogue and is often seen LFG for an instance for which he is far too low in level.
When you find yourself Grouped with people like this, your best course of action is to simply find another group. If that's not an option, then do your best to ignore them, and/or ask the Group Leader to handle it. If you are the group leader, simply Boot them and find a new member. If they are the Group Leader, either deal with it or leave, but keep in mind that you're probably destined for failure.