A friendly troll. Someone who is aicy trolls people but in such a way that everyone can have a good chuckle about it, not just him.
A regular troll does his actions to amuse only himself, however this is not the case with someone who is aicy. At no point does he insult anyone unlike a regular troll does.
I was on a forum the other day when someone started saying that "God hates all homosexuals" and we had a little banter for a while until he said something like "Hehe, I was only trolling you brohan. I don't think there's anything wrong with gay people either :P" which made me realize he was just being aicy. Afterwards we talked on skype for a while and became good friends.