A top loading crossbow. It would be small enough to be held in one hand, and have a rack above the currently loaded bolt containing bolts to be loaded. The bowstring would spring back quickly after firing, so that the weapon can be used much like the pistol from Half Life 2, except more suited for medium range combat, than short.
The bolt rack above would hold 12 bolts, plus one ready and loaded for a "magazine size" of 13.
Perhaps for boss battles, a fire attachment could be added, so that bolts, covered in pitch, get fired through a flame at the front end, catching on fire as they get launched.
Also I'd be up myself enough to give it some metaphorical, avant garde name, like "Love", or "Hope".