Originally Posted by
Aioros22
Black Mask has been paired against Jason as a main nemesis either as the main Underworld whom Jason takes the Enterprise off or the culmination of the Outlaws in comics and other media (Arkham Knight and Under the Hood). Joker is both a nemesis for Batman and Jason, he`s too deeply engrained in the character and his history not to, again in pretty much all media they both in. In Death of The Family, the only other bat besides Batman whom Joker had a personal tally with was Jay, down to personally considering him a creation of his.
Iron Rule are cybernetic mercenaries that Jason and Roy dealt with in the RRAA and the Untitled were the first main recurring villains in the Outlaws catalogue whose history was all from Jason`s unique past with the All Caste.