In most cases, it is legal to read or watch fanfiction as long as it is not being sold for profit without permission from the original copyright holders. Fanfiction is often considered a form of transformative work, which is protected under fair use in some circumstances.
It's a masterpiece. The graphic novel 'The Dark Knight Returns' is a game - changer. The art style is gritty and detailed, perfectly setting the mood for the dark and complex story. It shows an older Batman coming out of retirement, facing new challenges in a changed Gotham. The narrative is intense and full of moral dilemmas.
The main characters are Batman, of course. Also, the Joker is a major character. Robin is there as well. And there are some police officers who play important roles in the story as they interact with Batman, either trying to stop him or reluctantly working with him.
Well, in 'the dark knight returns story', the story is set in a future Gotham. Batman has been retired for a while. But crime is rampant, and he decides to come back. He starts to fight against the crime lords and also has to handle the return of his arch - nemesis, the Joker. And there are also some political and social elements as the city and the authorities react to Batman's return.