Well, it'd have to be a pretty dumb impersonator. My powers aren't magical, they're genetic. And if somebody with metal teeth tried to bite me, all they'd get would be shattered teeth.
Yeah. The vortex picks us up and deposits us here. Sounds weird, but take a gander through the boards. Superman, Batman, all sorts of people that shouldn't exist do exist here. Not really much other way to explain it.