Here's a few:
Katergar/Peter Solomon - A Catholic priest who grew up with an incredibly repressed childhood, who is constantly tempted into sin and debauchery. One night, after giving in to his vices and murdering his high school tormentor and his wife, after molesting her, Peter goes completely unhinged and renounces God. Chased after by the police and the Batman, Peter calls upon the Devil to save him, if he exists, and ends up hiding in an old molecular physics lab. However, found by the police and in a fit of panic, Peter accidentally activates one of the older machines, which blows up the lab, killing all the officers. But Peter? He is spared...and turned into a deformed freak, who looks like an ash-skinned demon with blood-red eyes, and new powers. Believing that he was spared by the will of the Devil, Peter pledges his allegiance to the Prince of Darkness, and takes the name Katergar, casting aside his human past. Now completely unstable, Peter sees the Devil's messages to him to carry out horrific deeds in even something so mundane as street graffiti...or is it everyone else that simply cannot see what Peter can see?
Powers & Abilities - Ash-black skin, blood-red eyes and sharp fangs, as well as a powerful tail, capable of snapping a street light in half. Also possesses a poisonous breath, has skin that's too hot to touch, and the ability to teleport distances of up to thirty meters, however he needs a pause of three seconds before being able to teleport again. Has a weakness to cold.
Crossbones/Quentin Bones - A fairly successful bank robber who found his criminal golden days come to an abrupt end after the appearance of the Batman, proving no match for Gotham's Caped Crusader. Desperate for anything to give him the edge that he needed in order to avoid having his bank robberies be foiled by Batman, and pay off the crime bosses whose debt he was in, Quentin participated in an extreme gene modification experiment by Hugo Strange, who use a variation of Dr. Death's bone-growth serum, which was ultimately successful. Empowered by his new abilities, Crossbones went to rob the Gotham National Bank, full of confidence. However, even his newfound powers proved useless against Batman, who still defeated him. Now at his wit's edge, Quentin has resolved to form his own gang, the Jolly Rogers, in order to establish himself as top dog in Gotham, and avoid a horrific fate for not paying off his debts. Only time will tell whether he is ultimately successful in this endeavor...
Powers & Abilities - As a result of his genetic modifications, Quentin now has bone growth all over his body, giving him a hideously deformed look. In addition, Crossbones now has the ability to extend or shrink any bone on his body as he wishes, as well as fire pieces of them as high-speed projectiles. He also possesses a regenerative factor, allowing him to heal from most injuries. He is also skilled at lock-picking and network hacking, is a decent marksman and explosives expert, and used to be a drag racer.
The Triple Threats - A set of triplets who were born with a unique condition known as triaflegic divarianism, where they were each born with one third of a larger brain, all of which nonetheless operate as part of a whole. As a result, the triplets George, Simon and Ian Rochester are quite literally a hive-mind, incapable of independent thought. Unwanted by their wealthy parents, who thought them to be retarded, the triplets were given away to an abusive orphanage, where their psychotic tendencies quickly came to the fore in their treatment of other kids. Eventually running away at the age of thirteen, the triplets resurfaced in Gotham years later as the notorious gangster Georgie "Flaps" Grimes, the cunning media mogul Simon J. Thompson, and the powerful tycoon Ian Maxwell proposing a new transportation system between Gotham and New York. What no-one suspects is that all of them operate as one individual, albeit a very intelligent and ruthless individual with a horrific secret and ulterior motive.
Powers & Abilities - While they each possess only a third of it, the Rochester triplets' larger shared brain is much more intellectually capable than that of an average human being. As a result of their connection, all of their skills, knowledge and even sensations can be exchanged between the three. However, this can sometimes prove their undoing, as they are all effectively one man who must remember that he is actually three different men, as exploited by Batman when him using specialized nerve strikes on Simon incapacitated George, when Ian began accidentally talking about things with Simon's girlfriend that only Simon and she would know, and when George, during a confrontation with Batman, began using identical mannerisms and speech patterns to Ian. As a result of their greater intellect, the triplets are gifted engineers, accountants, marksmen, tacticians, manipulators, hackers, and swordsmen, among a plethora of other talents.
Marcus Steele - A wealthy and innovative industrialist specializing in robotics, Marcus quickly became rich through his revolutionary advances in androids and cybernetic body parts, as well as power suits for the police. Along with Bruce Wayne, he launched a joint venture called "Brave New Gotham" which was aimed at pushing the City of Crime into an urban renaissance, with grand skyscrapers, futuristic transportation, and a safer populace. However, these soon came under attack by terrorists and criminals using technologically advanced gear, prompting a furious debate on whether Gotham's future could be preserved as crime-free. Marcus introduces his latest invention - a peace-keeping, highly advanced robotic guardian, designed to protect the people of Gotham. Meanwhile, Marcus' attempts to clear away the greenery of Gotham raises the ire of Poison Ivy, who wages war on him. With more terrorist attacks, Marcus pushes for harsher and harsher measures in Gotham, leaving Bruce concerned as he begins investigating the origins of the terrorist leader, the mysterious "Raul Secemtes", as Marcus is elected to a leadership position. It is eventually discovered that the attacks were false flags designed by Marcus to instigate martial law in Gotham, fueled by his childhood desire to protect his loved ones, and a reflection of Batman's own fascistic tendencies. Raul Secemtes is merely an anagram of Marcus Steele, and the technology used by the terrorists was provided by Marcus himself. Batman eventually defeats Marcus with the help of Poison Ivy, noting in the process that Marcus, much like Ivy, holds little regard for people, merely using the "safety" of Gotham as a shoddy pretext to work out his own personal issues and inability to let go of childhood traumas.
Powers & Abilities - Marcus is secretly a cyborg, having been saved as a boy from death via a horrific tragedy by his uncle, who also specialized in robotics, by being fitted with cyborg parts. His psyche, barely healing from the murder of his entire family, is further shattered when he witnesses the torture and murder of his uncle by gang thugs, while he is helpless. Over-time, Marcus modifies his cybernetic implants so that they are effectively invisible - much like a Terminator, his entire outer appearance is that of a human, but inside he is all machine. Marcus is also capable of effectively "turning" himself "inside out", where his robotic parts move to the exterior and his human parts move to the interior, giving him a more robotic look. He uses this partially to fake the appearance of the cyborg man Raul Secemtes, but Batman quickly notices the similarity in certain visible facial characteristics. In addition, Marcus is given away by the fact that his skin is almost always cold, and he has no pulse - almost all of his body is metallic, as Batman notices. As a cyborg, Marcus possesses a variety of in-built functionalities, including a self-repair mechanism, radio controls to send commands to his robotic henchmen, and a variety of weapons. In addition, Marcus seems to distrust most humans, noting to Bruce that he prefers robots "because they do not question, they simply obey". Marcus is also a scientific and engineering genius.
The Temptress/Angela Quinn - A beautiful young woman with an enigmatic past, since no one knows where she came from, or what he ultimate motive is. First appearing to a young Alberto Falcone, now disgraced and desperate to reclaim power in Gotham and restore his family's name, the Temptress promised him all of that...and more. Alberto got what he wished for - exactly what he wished for. Now the most powerful man in Gotham, Alberto finds himself the target of constant assassination attempts, a rebellious populace, and jealous underlings. The Temptress merely explains that what everything good comes with a bad - and that if he wishes to have the good, he must be prepared to take the bad. Eventually Batman resolves the conflict, but is unable to find out anything more about the Temptress, who merely appears to those she finds of interest, and grants them their deepest wish - in the most twisted and horrific fashion possible, whether it be a socially isolated boy wishing for popular friends and a beautiful girlfriend, or a newspaper editor with a traumatic past wishing to change his history. The only thing known about the The Temptress is a possible connection to a young girl named Angela Quinn - who died of cancer in Tennessee eighteen years ago. But is Batman's hunch correct? Or is The Temptress an entity beyond his understanding?
Powers & Abilities - Seemingly capable of altering reality itself, the extent of The Temptress' full abilities remain mostly unknown. She gets her name due to the temptation of fulfilled dreams that she provides to those who are truly lucky enough to be graced with her presence...or perhaps, truly unlucky.
Batman Writers, if you're reading, feel free to borrow these ideas. I literally just thought them up in the space of 30 minutes. Just be sure to give the old Orange Bat some credit, eh?
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