Trolls are creatures easy to recognize by their logname which present interesting variations around violence/sexuality/bad orthography concepts.
Exemples of adequate trollnames are: "deathsex", "dikmovr", "AdolfIsBack", "feukbastrd", "Teemosuks", aso.
Unlike Flamers who tend to flame because they don't want to lose the game, a Troll doesn't care much about the outcome and would even be happy to lose. The only enjoyment of a Troll is to be the match that starts the flaming war: an easy task thanks to all the potential Flamers who are in every game.
Nasty Trolls practice the art of direct and shocking vulgarity.
Examples: "you sucks", "bytch plz", "da idiot Akali"...
Subtle Trolls try to remain undetected, using the power of stupidity and slander.
Examples: "I don't think you're as bad as Akali says", "why do you talk to me like that ?", "why noone helps me ?", "I know the administrator and ppl like you are banned", "you accuse me ?", aso.
Trolls are rare here, because to be able to talk about their passion for Adolf Hitler
Spoiler: Click to view
and controversial sex behavior they have first to install the game and register and this is time consuming. That's why it is more common practice to troll gardening forums instead...
However some hard working Trolls in search of fame may study the game enough to gather information about what piss off the other players: such as taking Nami for jungling or contest the same lane as another player. Since that's exactly what many Noobs actually do with good intention, it's not easy to distinguish them from the Trolls.
The ones the others want.
Wards to decorate the base Nexus and welcome the enemy team.
Permanent ban. Players who know they can "/ignore".