I communicate with Neyra most often and enjoy it.
I simply have good relationships with Amko and Ment.
Rainy is a nice person, and it's interesting to talk to him.
Klov is a good guy.
Lizard is a brother in arms.
Siv, Ples, Nebo, Morny, Kosha are just good people, and I like them.
Arandor is... well, he's Arandor. :D
And then there's Uissi. :3 My personal troll-conscience.
Also, Omega, Ver, and Veg are good people, even though I haven't had the opportunity to communicate with them much.
So, I'm voting for NNV.
But in general, if I consider all forum users, it's probably WishmasteR. Delirious is a very close person, but with Wish, we have this kind of strong, brotherly friendship. ^_^