The two main characters are, obviously, Batman and Bane. Batman is the Dark Knight, the protector of Gotham City. Bane is a powerful and intelligent villain who has a vendetta against Batman. There are also some supporting characters like Alfred, Batman's loyal butler who often gives him advice and helps in his recovery. And there might be some Gotham police officers who play minor roles in the story.
In the 'batman vs bane graphic novel', a key plot point is Bane's physical and mental assault on Batman. Bane breaks Batman's back, which is a major event that shakes Gotham as Batman is incapacitated. Another point is Batman's journey of recovery and his determination to face Bane again. The power struggle between the two, with Bane's brute strength and strategic planning against Batman's detective skills and willpower, also forms an important part of the plot.
In the Injustice 2 Batman ending story, Batman manages to defeat Superman. He restores order to a world that has been torn apart by the chaos of the Injustice regime. With Superman out of the way, Batman is able to start rebuilding society, bringing back justice and the rule of law. He also has to deal with the remaining super - villains and ensure that they are locked away safely.
Nightwing is a great choice. He has a strong connection to Batman as his former sidekick. In an Injustice fanfiction, Nightwing could be the voice of reason when Batman starts to go too far in his fight against Superman. Their relationship, with all its history and baggage, can add a lot of depth to the story.
One great 'Batman and Bane Fanfiction' is 'The Redemption of Bane'. It shows a different side of Bane, exploring his possible path towards redemption. The author does a great job of delving into the complex relationship between Batman and Bane.
In the comics, Batman doesn't die at the hands of Bane. Bane is a powerful adversary, but Batman finds a way to overcome his challenges and live on to fight another day. Their confrontations are epic, but Batman's resilience prevails.
Batman himself is obviously very popular. He's the central figure and fans love to explore different aspects of his character in this 'injustice for all' scenario. His intelligence, combat skills, and unwavering sense of justice are always interesting to write about.