soren7550 said:
Depends on what weapon type you're looking at.
Bombs has to be the Atomic.
Guns has to most probably be the Barrett 50 cal.
Swords I'm no so sure of, but I think it might be the katana.
Knife I have to go with the WWI Trench Knife.
Pistol has to be the Desert Eagle (for overall firepower. Balance goes to the Luger.)
Person has to be Chuck Norris.
I'll agree with the bomb.
I would personally favor the Sabre as the best sword ever made, but it all depends on the historical context. In an age of firearms and cannons, the Sabre was still in ready and effective use - something that was not true of the Katana. It's light, it's quick and it's lethal. The only part of that you get with a katana is lethal.
For the knife, I believe one should look no further than the Bowie knife, which still provides the basis for many modern combat knives.
For the pistol, I would have to initially side with the Venerable M1911A, but I'd probably end up favoring a modern interpretation of the .45 ACP sucs as the Springfield XD Service or USP. The Desert Eagle is unwieldy, prone to stoppages (not due to any fault in the weapon - it's just you have to move a LOT of brass out of the way), uses an expensive and uncommon ammunition and doesn't offer any real advantage over the .45 ACP in terms of effective man stopping power for the trouble. Both are more than lethal enough to disuade someone who's been shot with one, and both are foiled by level II body armor.
In so far as a person in terms of a living weapon, I think one would have to look to any of the great generals or famed marial artists. There are far too many to choose from, but Chuck Norris is not found anywhere on my list of such entities since, for all is efforts, he seems to rarely achieve lethal effect on any of his victims.