Mario or Luigi, killing things by jumping on their head has to be pretty overpowered. You need garrus v from mass effect to take out the stuff they can't reach, maybe throw wrex in there for the hell of it. I would send Conker, because everyone loves conkers bad fur day. Crota especially. Finally I would have pacman. Dodge the hive like a mofo and turn it on them when he eats an orb. Gobble gobble.