(Idea for his special knife move thingy-mo-bob that would make it different from other projectile moves)
You hold the B-button (or whatever the special move thing will be) and as you hold it more knives begin to appear and fly around him, with a max of 4, making a sort of slight temporary defense (when someone attacks him, it hits one of the knives instead), like in SS, and if someone hits one it falls to the ground and disappears. Once you release the B-button, the knives will fire forward and have a slight heat-seeking effect on enemies within 3 feet of a knife (I'm talking compared to the characters, not actual measurement, of course). He also wouldn't be able to move or anything else while using it, that wouldn't be fair (or he'd move very slowly).
There, now you can't say anybody else has it.