If you were to create a weapon...

A baseball bat that actually shoot lasers.
Oh yeah, you actually shoot balls with it too, but lasers are much, much more awesome.

If you press a button, it would create an laser shield that reflects things and..

...i should stop here.

 

A giant toe. It smell even exists in space.

 

A large shield for bashing and charging. It'd have a good design/symbol on it too! Dual wielding shields too.

 

If i were to invent a gun it would have someting to do with a shark like a minisharkor a megashark i know!!!!!!!!!!! a super Sniper Shark it would be a gun but the frame would look like a shark and the end (were the bullets come out) would come out of the sharks mouth

 

A Laser-Chair.

 

A watch... THAT CAN SHOOT LAZORZ!

 

A flame throwing hand.

 

Sounds like something out of a Spy movie.

Pinkie Likes.

 

I would create a flying mechanic orb, which would shot powerful lasers, and he would have some awesome claws.

His name would be UFF (Universal Flying Friend)

 

A giant boxing glove on a spring. SPROING!

 

A lazer boomerang type thing with a remote-controlled detonator that would destroy the item but cause huge splash damage.
Wait, Naga already suggested Light Boomerangs... Oh well.

 

A boomerang grenade

 

Rainbow laser shotgun. Yup. Don't ask how it works, its filled with magic.

 

a Kitty shooter. don't knock it though. the cats are robot controlled. i shoot them into your home. they seduce u with their epic cuteness. then they will kill you with meathods such as,
Razor claws
Lazer eyes
Knife fur ( all fur are razor knives)
Exploding hairballs
Cosmic meows
and a whole other slew of weapons i dont care to list

 

A large tuna, the greatest melee weapon known to mankind.

 

A Megaphone that can propaganda people to death.

 

Instead of a grappling hook, a grapple gun. It brings smaller enemies to you, brings you to bigger enemies, and functions as a grappling hook does. It can be two handed or one. If one handed, you can dual wield them, allowing you to grab other players/enemies and drag them up cliffs.

 

This. Pulling enemies would be great especially in PvP.
There should also be a gun which pushes back enemies [depends on the size of the enemy]. It has unli ammo but, has a slow firing rate so this is used when in tight situations.

 

Shieldgun/impacthammer, unreal style. Releases an extremely hard pneumatic punch strong enough to dismember bodies and even harm the carrier if used against a static object or a wall. The weapon can either be charged up over +5 sec to deal massive damage when released or used in small bursts to deflect projectiles and hammerjump (rocketjump style). Blocking this weapon with a shield would deal equal amounts of damage to the attacker and the defender. This is obviously a closerange weapon as you basicly need to touch the target with it.

Actually it would be interesting if the grapple hook just worked with "real" physics. It pulls both sides differently depending on their weight, for example if you grab someone similar to you then both will end up in the middle.

 

maybeeee the zapinator... bum bum buuuuuuum