Yes, it is rather hard in praxis to tell apart an evil character from an evil player

Hmmm... maybe it would be more obvious, if you were more outspoken. Mock players in a very RP-ing way (avoiding \"lol\" and \"n00b\" and such words) and thus make them see clearly that your character is evil. In the start you would probably have to make yourself a name of being an evil character ...which means you would have to persuade a lot of players that doing havoc is your solely character\'s and not your own intention.
But I think the best suggestion, I can give right now, is that you should at first really make people understand - that\'s going to be hard. The best way that I can think of, is that you at first (untill you get a solid bad name as a character and a good one as a player) openly announce your actions ...try to play the role of an evil guy who\'s not trying to be secretive about his actions, I guess.
What I mean:
do this:
\"Why, hello, hello... If I don\'t see a new pray for my little sport right down there\"
*Nyramael grins, his sharp white teeth shining under the shadow of his hood*
(then you jump to the character/pray)
*Nyramael eyes his pray and spits*
\"Hmmm, doesn\'t look like you\'re worth much, but every little thing counts in these hard days.\"
(you pull out your weapon)
\"Say, pray ...do you crave for death? Or do you have something you can offer me, so we both get on our way happier ...me without needing to wash your dirty blood of my dagger, and you ...well ...with your head still on your neck, hahahahaha\"
instead of this:
(you stab the poor bastard without any notice)
*Nyramael rapes the head of the n00b*
\"lolz0rz ..3y3 0wnz j00 n00bz!!!\"
*Nyramael peanuts peanuts t3h peanuty n00b\"
Or when you steal someone\'s stuff on the ground ...return it the first time and tell them kindly (again, in a role-playing manner!!!) that the next time, you won\'t be so kind and that your black heart hurts when you give fairly stolen loot back, but that you have a reputation to maintain

p.s. sorry I carried away with that \"peanuts\" joke
