One idea could be that Catwoman steals a valuable item and Superman is tasked with retrieving it. But as he chases her, he realizes she has a noble reason for the theft, like helping the poor in Gotham. So, instead of simply arresting her, he decides to help her find a legal way to achieve her goal.
Maybe there's a situation where an alien threat arrives in Gotham and both Catwoman and Superman have to team up. Catwoman uses her stealth and street - smart skills while Superman uses his superpowers. During their adventure, they start to respect each other's abilities more and form an unlikely friendship.
Maybe there's a plot where a powerful alien force arrives on Earth and starts causing chaos. Superman is having a hard time dealing with it alone as the aliens have some new form of kryptonite - like energy. Catwoman, with her stealth and street - smart skills, discovers a way to neutralize the kryptonite - like effect, and they join forces to save the day.
One plot idea could be that Superman and Catwoman are forced to team up against a common enemy, like a powerful alien or a supervillain who is threatening both Gotham and Metropolis. During their partnership, they start to understand each other's motives and develop an unexpected bond.
A possible plot could be that Lex Luthor teams up with some of Catwoman's foes to frame her for a major crime. Superman is initially sent to capture her but as he digs deeper, he realizes she's been set up. So he decides to help her clear her name. During this process, they have to hide from both the law and their enemies. In the close quarters and the shared danger, they form an unexpected bond.
Maybe the Joker has some information that Catwoman desperately needs. In exchange for it, she has to help him with one of his crazy schemes. Along the way, Catwoman tries to outwit the Joker and turn the situation to her advantage while still getting what she wants.
Maybe they are forced to team up against a common enemy, like a powerful new villain in the city who is threatening their usual heist targets. At first, they don't trust each other but gradually learn to work together. For example, Catwoman's knowledge of the Gotham underworld and Blackcat's experience from her own city could combine to defeat the foe.
A great plot could be that there's a masked vigilante hunter in Gotham who targets both Batman and Catwoman. They have to hide from this hunter while also trying to figure out who it is. Along the way, they take refuge in an abandoned part of the city and during this time of forced proximity, they have deep conversations about their motives, their pasts, and what they really want for the future of Gotham.
One idea could be that your original character (OC) is from another planet similar to Krypton. They arrive on Earth and initially clash with Superman over different approaches to protecting the planet. But as they face a common powerful enemy, they learn to work together and combine their unique powers.
A territorial dispute could be another plot. Black Cat has been operating in a certain part of the city for a while, and Catwoman moves in. They start a battle of wits and skills to see who gets to claim the area as their own hunting ground for valuable items. This could involve a series of rooftop chases and close - quarter combat scenes in the city's seedy alleyways.
One plot idea could be that Catwoman and Black Cat team up to steal a valuable artifact that has been causing chaos in the criminal underworld. They start off as rivals, each with their own motives, but as they work together, they begin to respect and even like each other.
A cool plot could be that a powerful alien race arrives on Earth and offers a deal to the world leaders. Batman is suspicious of their motives and starts investigating. Superman, on the other hand, is more open - minded at first. This causes a rift between them. As Batman uncovers more evidence of the aliens' true intentions, he has to convince Superman. In the end, they join forces to stop the aliens from taking over the Earth.