It could be a melee weapon, a gun, or even something fruity like a magic wand or bubble blower, as long as it makes you happy using it.

For me it's the Splat Charger. Simple, elegant, if i miss it's my own fault, if i hit i bag a kill and a fat dink sound.

Anything you can do, I can do better! I can do anything better than you! but only for melee weapons that don't include concealment