Мафия Alternative. Zombieland.

Well, essentially, the peace symbol can be attributed to many. Everyone has some quotes or phrases about peace/war in their profiles.
There's also Torii's method, but few players would consider any indirect evidence as significant.

I can even put myself forward – my signature perfectly reflects pacifist views. But it's better to remove Tox, rather than me (for the Mafia). Especially now that I've read his analysis. I don't think he's the killer.

Added 2 minutes later
and Reinhardt, with his posts, is increasingly raising my suspicions. He's certainly not Adg, but he's not peaceful either.