I'd call him "Pocket Protector", because in the beginning of the game, his arsenal would only consist of whatever could be ordinarily found in someone's pocket (and not just lint). I mean like a paperclip, or string, maybe pebbles, or a safety pin. Y'know, and they can use anything they can get his or her hands on, and even combine stuff to make better weapons, like attaching string to a marble to make a mini morning star, or finding a pool of glue, and sticking a safety pin to a toothpick to make a mini halberd or something. You can even modify stuff, like unbending a paperclip slightly, or all the way to give it wider attack range.
And in the game, your objective would be to just defend a room of the house or something of the sort. Objective still needs ironing out.
I know, the concept is kinda stupid, but in a good way. I don't care if the idea's stolen, or whatever, I'd just like to see it.