The newest Hero Factory MOC is a Breakout hero, namely Greasegunner v.4.
There is really no backstory for him; he was just created to use a special Hero Factory weapon modeled on a M3 "grease gun" submachine gun.
His left hand is a claw, which may suggest villainy, but it was just put there for an "accent" on the character. It could also be a power glove of some sort.
Well, that's Greasegunner for you! More MOCs to come as always!