Alright, I've put some thought into my character then and I think I've come up with something I like. 

I'm imagining someone tall but not too tall, maybe 6'1 or so, he'd be fairly narrow but not lanky, a lean physique. He'd have milky skin, scar flecked - mainly around his hands and forearms. He'd have honey-colored hair, shorter on the sides and rear and long and messy on the top; a casual crew cut. He'd have a long face with sharp features, an angular jaw and and thin lips, topped with an imperious nose and large brown eyes. On the right side of his neck he'd have the cog shaped wheel of the vault tattooed in with its number in the center, below his ID number and occupation. 

Speaking of occupation he'd work in maintenance, a few years of experience and in his mid 20's, he's a charming, warm chap with a thick accent despite the lack there of in the vault. In his off hours he'd smoke hand rolled cigars, made of 'recycled organic matter', drink liqueurs brewed in the most secluded buckets of the vault and brawl in arranged fights deep in the gutty works of the bunker, for extra rations of luxury stuffs. 

I'm not sure what special skills I'd need though, they are all so nice!