Carl Rustbucket

This character doesn’t work at the garage, but you’d never know it by the way he’s always hanging around, offering unsolicited advice to anyone who’ll listen—or even those who won’t. He’s got a habit of showing up with a lawn chair and plopping down right outside, cracking open a can of warm beer from his cooler and holding court like he owns the place.
This character has got a story for everything, most of them wildly inappropriate or straight-up unbelievable. He’ll regale anyone within earshot with tales of “the good old days,” which usually involve excessive drinking, questionable decisions, and a mysterious “incident” involving the town’s water tower that nobody can quite get him to explain. He’s also a self-proclaimed expert on all things automotive, even though his advice is usually useless—or dangerously wrong. “All ya gotta do is whack it with a wrench and she’ll purr like a kitten!” he’ll say, while the mechanic facepalms in the background.
His real passion, though, is conspiracy theories. He’s convinced that the garage is a front for a secret government operation and that the cars are being bugged with tracking devices.