You cannot tell by a person's skin color whether they are good or bad.
You need to talk to them and get to know them before you could tell that. If they are very unfriendly and try to take your stuff from you even when you ask them not to, or spit and growl at you and call you bad names, then try to find nicer people to hang out with.
Even if they did that you still can't tell if they are good or bad though. They just might have been changed recently into a human from a dog. Or they might be a werewolf, and that could happen to anyone, white or black!
The only person that really knows is Santa Claus, and I've written to him before asking and he never gives me a straight answer. I suspect that he probably doesn't care that much either. I've seen some pretty crooked people get some pretty wicked presents at Christmas.
Give people a chance and try not to judge them before you get to know them and you should be all right.
Answered Jan 01, 2011
Edited Jan 01, 2011