Originally Posted by hallomik

Farmer – Spends significant in-game time repeating areas for drops.
Guild Hopper - Skips from guild to guild getting what benefit he can before jumping to another.
Leecher – Joins group and then contributes zero. Wants to profit from the work of others.
Local chat Spammer – Repeatedly, rapidly posts the same message killing the chance for casual conversation.
Loner - Anti-social types who only ever play with heroes or solo.
Outrager - Uses local chat for racist, sexual, politically extreme, etc. comments.
Perfectionist – Verbally rips teammates who make slightest error.
QQ’er – Complains constantly about every aspect of the game.
Rage Quitter– Gets mad and leaves party high and dry.
Synch-farmer – Trys to “cheat” the random arenas by simultaneously joining.
Scribbler - Draws crude images or fills minimap with rapidly drawn white lines.
Skill Nazi – Demands very specific builds and compliance or won't play.
Troll/Griefer – Provokes emotional reactions in others by unwarranted insults and attacks.