Family is a common theme. The relationship between Batman and his sister often explores family loyalty, love, and how they deal with the secrets within the family. For example, in some fanfics, the sister might discover Batman's identity and they have to navigate that new situation together.
Gotham as a setting is also a theme. The dark and dangerous nature of Gotham affects both Batman and his sister. It can be a place that they both want to protect or it can also be a source of conflict as they try to make the city a better place while dealing with its many problems.
One common theme is the clash of different worlds. Batman is very much a grounded, dark hero from Gotham, while Hawkgirl has her alien and mythological roots. Their coming together often involves dealing with this contrast. Another theme is trust. Since they are from different hero groups, they have to build trust to work effectively together.
Love and attraction can also be a theme. Some fanfics explore a romantic relationship between Batman and Superwoman, which is an interesting take as it goes against the more traditional pairings in the DC universe. This can add a whole new layer of drama and character development to the stories.
One common theme is the struggle between good and evil. Batman represents justice and Selina often walks the line. Fanfics explore how this dynamic affects their relationship.
The theme of justice is also prevalent. They both seek justice but in different ways. Batman aims for a more moral and non - lethal justice, while Huntress may be more willing to cross certain lines. Fanfics often explore how they handle situations where their views on justice clash and how they come to understand each other's perspectives better over time.
The exploration of the limits of his humanity is another theme. When he's hurt, we see that he's not invincible, and it makes the readers connect more with his character on a human level, rather than just seeing him as a superhero.
The idea of insanity versus sanity is also prevalent. Joker's madness is contrasted with Batman's rationality, and many fanfics play around with how these two states can sometimes seem to blend or be misinterpreted. For example, in some fanfics, Batman might be pushed to the edge of his sanity by Joker's actions. Another common theme is the concept of redemption. Some fanfics might explore the possibility of Joker being redeemed, or Batman losing his way and having to find his own redemption. This adds a layer of depth to the characters and their relationship. It also makes the readers think about the nature of heroism and villainy in different ways.
One common theme is the struggle between Batman's duty to Gotham and his love for someone. He has to protect the city but also wants to be with the person he loves, like in many fanfics where his lover is in danger because of his enemies.
One common theme is the duality of good and evil. Batman represents order and justice, while the Joker represents chaos. Fanfics often explore how these two opposing forces are intertwined. For example, some stories show how Batman's strict moral code can sometimes lead to unforeseen consequences, and how the Joker's chaos can have a strange kind of logic to it.
The theme of secrets and hidden knowledge is also common. Zatanna has a lot of knowledge about the magical realm which is often hidden from Batman at first. Fanfics play with the idea of Batman uncovering these secrets and how it changes his perspective. And sometimes, Zatanna discovers things about Batman's world that she didn't know before, creating an interesting dynamic between them as they both learn from each other.
One common theme is the love - hate relationship. They are often portrayed as attracted to each other but also at odds due to their different moral compasses. Another theme is the idea of redemption. Catwoman might be on a path to redemption with Batman's influence.