TLDR; (Signature) Order of the Eight Virtues - Pacific, (Avatar) Master of Newbie Killing - Siege. VvV personally I lean towards virtue, as for the guild its whatever someone feels like and everyone rolls that way like a pack of dogs.
It's pretty much all about me being lazy and I need to update my signature picture! Order of the Eight Virtues is my ancient guild from Pacific. Lyconis was my first dexer on Pacific that I played like crazy for years back when I registered on stratics in the early 2000's, I kept the name after I lost that account when stratics did the import thing. My Avatar is Dubhdara from Siege. I still play off and on both Pacific and Siege but I enjoy Siege more which leans more towards the community, Siege doesn't seem to have major clicks that banish outsiders and drama is reasonable.
Masters of Newbie Killing is my Siege guild. It makes absolutely no sense what so ever outside of the cool fact that it sounds like He-Man Masters of the Universe and we like wearing Monk robes.
As for Vice or Virtue I can speak for myself that I usually don't tend to go out and kill players even if they are newbies. I would consider myself more Virtue than Vice. I do like killing players that "need" it, either from just running their mouths, being dumb, holding ground, or in defense.
I don't consider myself a hardcore PVP'er but if someone tries to kill me and I kill them the MONK name makes me laugh. I just think about how I consider myself a newb and if I kill someone the guild name automatically calls them a newb for failing to kill me.