Four of Them

That is, which ones are both self-sufficient and closed-off enough that they could shut down any travel and bunker down?

This, of course, excludes Samuel L. Jackson. And pygmies. They are, respectively, badass, and badass motherfuckers. Seriously. Zombies are probably allergic to them. If one came waddling over, either/or would rip them apart, burp "What up, n00b?" and carry on their business. Or whatever.

Discuss.