I don’t know about a weapon, but I figure with trioxin based armor, I would at least be able to eat my killers BRAINS.
Ah, but surely you mean the organic gravity gun, the one that allows you to toss combine soldiers around like rag dolls.
I’ve always admired the Sick Stick from Minority Report. It doesn’t matter how big or strong you are, no one likes to be instantly sick and forced into projectile vomiting.
Jimmy
Bladed weapon; Klingon Bat’Leth
Energy weapon; Federation Photon Burst (from the Star Trek Voyager Elite Force game, basically a man-portable photon torpedo launcher)
Projectile weapon (long arm); the Zorg ZF-1 (gotta love Replay 
) or the Cerebral Bore
Projectile weapon (hand);Robocop’s AutoMag pistol
Convertible weapon; Qualta Blade/Rifle
Humorous weapon; The Point-Of-View gun
Lego thinks sharks with head-mounted weaponry is cool too. 
Seriously? It may be a conduit for powerful magic, but ultimately you have to face the fact that it’s just a big scab.
Plus, if you have one, you evidently can’t wear any clothes. So it’s probably not an ideal cold-weather choice.