There's a traitor among us... Who is the most suspicious?

I don't known enough about most of the members listed here to have a strong opinion... but historically I would exclude classigla and UnovanZorua...

I mean they have been consistently around for about 3 or 4 years... if they were bad actors they would be banned by now I guess.

You didn't say it is Hades0919, it could also be a hades4637

... Vulpix