If you could be..

[Laggy Blazko]

armor bonus (old DooM version so you can have more than %200 armor)

[Archfile]

Pistol - Use me until you find someone better.

[Tux]

skullpile candle. I'm cool and provide light.

[someoneelse]

I'd probably be a ColorSetter. "summon colorsetter" and guess why.

[Torvald]

A Stimpack. So people can remember what time I spawned during a scrim or priv match.

[Cruduxy]

While not doom, I'll pick mweapwand, just because its sound will drive people insane and must be heard over and over the entire thing!

[Ivan]

I'd be the keycard/skull key, the color isn't important. Without me, you can't progress! (Unless the maps have none but most of the time there's always one)

[Cruduxy]

Don't forget its always cool blue key is usually in different places depending on skill level :p

[Obsidian]

I'd probably be the Computer Area Map: a hell of a lot more useful than you think.

Failing that, a spawn cube so I can be a vindictive bastard and telefrag you.

[Lollipop]

I would be an ssg, it is badass, and I am very ammo efficient.

[mifu]

Id be the BFG9000, because I have a big...... blast radius when my ball hits?

[massacrebosco]

Computer Area Map, one of the Doomguy's best friend.

[porcelain echo]

The fist.Because if I run out of ammo,I can still smack the shit out of an imp,or pinkie.

[BURZUM]

health bonus 1%