If fallout acctually happened,

[garfield2326]

i would be a tech specialist for a group of mercenaries or dead, probably dead

 

[William Dickbringer]

(realistically) I would be trader inside rivet city that seems to be safe
(not so realistic) I would be loner traveling the wastes finding cool stuff

 

[Berserker119]

If anything slightly bad happens, I'm probably going to die immediately.

 

[MinorInconvenience]

*kicks plastic crate full of bottle-caps*

I knew these babies would come in handy.

 

[TheDoctor455]

I'd probably be dead by that point... or a Ghoul...
hopefully a sentient one...

 

[Cazza]

Relic Hunter finding anything anyone wants.

 

[Redratson]

loner more or less, traveling the waste and scrapping a quick buck here and there, oh my bad. A few Caps here and there

 

[BlackStar42]

Dead.

 

[kommando367]

I'll take merchant with high amounts of stimpaks and ammo. When the protagonist pops up, I'll be loaded.

 

[Fragged_Templar]

I'd be the mysterious stranger, conveniently showing up to save your pitiful hide just when it looks like its all over for you... and then dissappearing just as suddenly leaving nothing behind but a few footprints and empty bullets casings.

 

[Valkyira]

I would find a settlement and stay there until I die. Or I would be a regulator. Those guys are fucking awesome.

 

[Piflik]

BoS Paladin...

 

[Vash108]

I would have a Casino and lots of guards.

 

[DeathsHands]

The best Paladin ever.

 

[Imperioratorex Caprae]

Considering if Fallout "happened" now, we'd all either be dead or living in holes/caves/vaults/shelters.
So.... a corpse?

However, if there is a time shift somewhere and Fallout's events happen prior to my birth, then... I'd probably be a wasteland wanderer, either dead on the side of the "road" due to treachery or not quite being fast enough on the reload. Either that or I'd try to carve out my own evil empire from the ruins, just waiting for a nemesis to appear and thus a battle ensues for the control of said empire, ending with my disappearance and apparent death, only to reappear later on with a "Fallout 3 was just a setback...".
Might as well make drama in an otherwise bleak and boring world.

 

[Lordmarkus]

Probably a Ranger. I get a nifty Trenchcoat and can go and kill slavers on a daily basis.

 

[thahat]

sitizen, probably in some form of community guard, that or spotted by a larger orginisation as a potential siege engineer XD

 

[Danzaivar]

We'd all be in the vaults until we're really really old. Or dead.

 

[zehydra]

A loner, but to tell the truth, I'd probably be dead.

 

[RooftopAssassin]

I think we say we would be plenty of things. I'm guessing I'd be food for the radroachs. Just being realistic.

Or you know, you could be creative and use your imagination and give a viable answer.

"I'm a realist"
"No, you're an annoying douche bag"

I would be a merchant in Rivet City. It's safe there. I would occasionally go out on trading expeditions though.