I just see people as I see people in rl.
You've got several 'groups'
Those that barge in without introduction - and to the 'untrained' eye would like like they've been here/known people here forever
Those that come in and introduce themselves, almost in a "can I join you" type way.
Then once they've 'arrived'.....we have
Those that are quite happy to open their big gobs and say what they think, without worrying what other people think.
Those that sit quietly at the side, and only "speak" occasionaly
Those that speak out, loud and frequently, but do their utmost to "keep the peace"
Those that don't speak very often, but when they do - boy do you know it