Wolf
Wolf is a war veteran. Of EVERY war. There isn't a battle in recorded history that Wolf hasn't fought in, escalated, or outright started. There's even a cave painting in France that depicts a pretty remarkable likeness of Wolf mowing down Neanderthals with a Gatling gun. The Brotherhood had long hoped to get Wolf signed on full-time, but nobody wanted to work with him. He's Not what you'd call a "team player." Only Gabriel was brave foolish and desperate enough to give him a shot.
Everything Wolf throws explodes by the way.