RULE #1: DON’T GET NOTICE
This isn’t drama class, you don’t want to stand out. Try to become as faceless and personality-free as possible. There’s just no upside to putting yourself out there to be noticed by either the good guy or your boss, the meglomaniacal villain who thinks nothing about throwing you in front of him to save his own hide. Standing out is a surefire way for the hero to notice you and pay special attention. When that happens, you end up with a gruesome ending — a plane propeller through the head, a grenade stuffed down your throat, or cleaved completely in half. Come on, you don’t need that kind of pain. If you’re going to go, mind as well go from a perfectly random bullet to the head. There. A quick and painless death. Beats getting stabbed in the crotch or a fire poker through the eye. Hell, if you’re REALLY bland and show little interest in really sticking it to the hero, once he takes down your current boss, he might just decide you’re not worth wasting a bullet on.