this is such a great thread.
without a doubt, the biggest influence was a stalker named jameson-X0 something.
i had just gotten COH (my first MMO) and started to lvl my first toon. i decided to enter BB after reaching lvl 20-25 having never been a part of pvp like this ever.
i really had no interest in pvp as i assumed it was very difficult and cut throat (and i was right).
well, wouldn't you know it. there was this stalker who had beaten me and frankly, could kill me at will on a regular basis. worse of all, he mocked and taunted me as well.
well, after that, and hearing about all the pain and grief stalkers were doing, i decided to do something about it. i wanted to be the stalker griefer on Justice.
well, interestingly enough, i met up with jamey recently. had a short but good converse, than proceeded to chase him throughout the zone. boy that guy can run, but at least he was the one doing the running [with all due respect of course

]
another big influence was angry cheerleader whom i had met, and fought in BB as well.
oh yes, big props to my first sg leader, kab!