For season 4 of the Arrow, one of its regular cast John Diggle is getting an upgrade. Pictures on the internet going around showcasing his new uniform and helmet have many speculating as to what comic book character he would be portraying. Several names have been dropped including Green Lantern or Guardian, however my money is on the character Gangbuster.
His name is the comics is Jose Delgado and he has no known super powers, just good combat and martial arts skills. The initials of his name are the same as John Diggle (J. D.) and given their similar skills, initials and helmet appearance, I believe we can conclude this is the route the show might be taking. We wait to see if his new name would be dropped in the first episode of the show or not.