WARNING: The following article contains spoilers for The Joker #8, on sale now from DC Comics.
Jim Gordon's hunt for the Joker has presented him with some strange allies. After being kidnapped during his dinner with Madam Halloween, Jim ended up on a boat with Vengeance, the daughter of Bane, who has also been hunting the Batman villain. In Joker #8 (by James Tynion IV, Guillem March, Arif Prianto, and Tom Napolitano), her quest to kill the clown reveals her true origins as well as the artificial nature of her hatred. In the process, she also discovers that Bane's hatred of Batman was planted within him over time in a way that is very similar to the Superman villain Doomsday, whose hatred was genetically inherited over the course of his many deaths.
Vengeance detailed her exploration of the laboratory that the Joker attacked, revealing that when her soldiers defied her orders and torched the area, it unveiled a hidden laboratory. Inside, she discovered evidence left by the Joker that outlined her origin. As it turns out, the leaders of Santa Prisca, although they could not control Bane, wished to have his power on their side. So they created Vengeance, addicting her to venom from birth and implanting a hatred of whoever they wanted her to kill before releasing her from her containment unit.
Bane was much like his daughter in the beginning, with his hatred of Batman psychologically implanted rather than being of his own volition. The only difference was that Bane was uncontrollable. His charisma and intellect led to his opposing his creators and ruling Santa Prisca in their place. Vengeance, on the other hand, appears to be stuck in her programmed hatred for the Joker, and seeks to murder him even though he has never actually wronged her.
In many ways, this makes her and Bane similar to Doomsday. The original concept of Doomsday was that he was an experiment in evolution. An alien scientist grew a baby in vitro and released it onto the surface of prehistoric Krypton, well before its native Kryptonians became the dominant race. At this time in history, Krypton was an extremely hostile environment and the infant was killed swiftly. The scientist then gathered the remains and cloned the child, repeating the experiment over and over again.
It was cruel and ruthless, but sadism was never the goal. With each new iteration of the child, he evolved more and more becoming better able to adapt to dangerous situations. But the trauma of each death lingered within his DNA, embedding a permanent hatred for all living things within the being that would eventually become Doomsday.
This instilled hatred would drive both Doomsday and Bane to successfully defeat their opposing heroes during the 90s. To this day, Doomsday remains the only villain who successfully killed Superman in a one-on-one fight, owing it to his ability to adapt and match the Kryptonian's strength and endurance. But it was never a personal hatred of Superman so much as a general hatred of all living things.
Bane likewise despised Batman, traveling across the world just to kill him. His hatred of the Bat stemmed from the belief that Batman was the personification of a bat-demon that tormented his dreams. Now though, it has been made clear that Bane was conditioned to target the Dark Knight over time, his hatred being nothing but a byproduct of others' ambitions. The lives of both Bane and Doomsday have demonstrated that forcing blind hatred onto another living being can have disastrous consequences, even for DC's most iconic superheroes.