Lightning can't protect. It's too destructive, and Vergil was exactly like the lightning he had control over. That was probably the reason why Monkey D. Luffy, a rubber man immune to lightning, could get him to become a pirate. Still, if a devil like Vergil could follow a human, then perhaps lightning could protect. (NamixOC) (Current Arc: Little Garden)

It can't be good when a boy wanted by the World Government is picked up by the Whitebeard Pirates. It isn't any better when one of their most notorious crew members, Portgas D. Ace, takes a special interest in him. It only gets worse when his good for nothing brother, Monkey D. Luffy, wants him as his Nakama. [Current Arc: Skypiea]