It could also be a story of redemption for Copperhead. Batman might see something in her that makes him believe she can be reformed. So he tries to guide her away from her life of crime. The fanfic could show the process of her transformation and how their relationship evolves during this journey.
It could be about an unexpected alliance. Maybe Batman and Copperhead are forced to team up against a common enemy in Gotham. This could lead to some interesting character interactions as they have very different moral compasses.
You can try searching on fanfiction websites like Archive of Our Own (AO3). They usually have a wide range of fan - created works, including Batman x Copperhead fanfics. Just use the search bar and type in the relevant keywords.
There could be many interesting fanfictions about Copperhead in Batman: Arkham Origins. One could be about her backstory before she became a villain in the game. Maybe she had a difficult past that led her to a life of crime.
One common theme is the battle of wits. Batman is known for his intelligence, and Copperhead is no slouch either. Their encounters often involve outsmarting each other.
In some fanfiction, Copperhead could be a reformed criminal who seeks Batman's help to take down a more dangerous criminal organization that she once was a part of. This would involve a lot of character development for Copperhead and an interesting dynamic with Batman as he decides whether to trust her or not.
A theme that is also seen is the exploration of Copperhead's abilities. Fanfiction writers might play around with how her snake - like abilities work in different situations against Batman. For example, how she uses her flexibility and venomous attacks in a fight, and how Batman counters these unique abilities with his own skills and gadgets.
The male OC could be a traveler from a far - off land who stumbles into Copperhead's territory. Copperhead sees the male OC as an intruder at first. However, the male OC has unique skills or knowledge that Copperhead's group needs. So, they form an uneasy alliance. As they journey together, the male OC shares stories of his homeland, which intrigues Copperhead, and they gradually develop a friendship that turns into a deeper bond over time.
Maybe the fanfic could be about a situation where Amanda Waller has information that could expose a major corruption in Gotham's political and criminal underworld. However, she can't act on it directly without causing a political uproar. Batman, on the other hand, can operate in the shadows. Waller approaches Batman to help her bring down the corrupt elements. Along the way, they face many obstacles, including attempts on their lives by the very people they are trying to expose, and they have to rely on each other's unique skills to survive and succeed.
Perhaps in the 'naruto x batman fanfic', there's a threat that endangers both the Naruto world and Gotham at the same time. A powerful interdimensional villain is causing chaos. Naruto and Batman meet in a neutral dimension and have to quickly learn to trust each other. Naruto teaches Batman about chakra control to enhance his combat skills, while Batman shows Naruto how to use gadgets and strategic thinking to outwit their enemy.
It could be another powerful character who is jealous of the growing relationship between Copperhead and the male OC. This character might see the male OC as a threat to their own power or influence over Copperhead. For example, if Copperhead is a leader in a certain group, this antagonist could be a rival within the group who wants to undermine Copperhead by getting rid of the male OC.
It could be a story where Alyx somehow gets transported to the Batman universe and teams up with Batman and Gordon. Maybe she has some unique skills or knowledge that helps them solve a big crime in Gotham.