Alfred is a character that can't be ignored in Batman scars fanfics. His loyalty to Batman is unwavering, and he might be the one to nurse Batman back to health after getting the scars. His father - like figure could be emphasized more as he tries to help Batman come to terms with the physical and emotional changes. Another character could be Bane. He might see the scars as a sign of Batman's fallibility and challenge him to a more brutal fight, testing Batman's limits both physically and mentally.
One interesting storyline could be exploring how Batman got his scars in a different way than the traditional origin. Maybe in a fanfic, he gets the scars while protecting a young orphan who later becomes his sidekick. Another could be a story where the scars are a source of new powers or a connection to an ancient prophecy.
One common theme is redemption. Batman's scars are often used as a starting point to show his journey towards self - improvement or atoning for past mistakes.
Batman himself is obviously one of the most popular characters. He is the central figure and the source of the 'badass' factor in the fanfic. The Joker is also very popular as he provides a great contrast to Batman with his chaos and madness. Harley Quinn is often included as well, with her complex relationship with the Joker and her own brand of insanity. Another popular character is Robin, who represents the sidekick and the future of Batman's legacy.
Robin, in all his incarnations, is also a popular character in fanfiction related to Batman. He represents the sidekick aspect and the growth and development that comes with it. In Batman Beyond, Commissioner Barbara Gordon also features prominently in some fanfictions. Her connection to the original Batman era and her role in the new one can be explored in interesting ways.
There's also a fanfiction called 'Scars of the Dark Knight'. This one focuses on the origin of some of Batman's scars and how they've influenced his relationships, like with Alfred. It's really interesting as it gives a new perspective on his bond with the people around him.
Batman himself is of course extremely popular. He is the central figure, and in 1939 fanfiction, people love to explore different aspects of his character, like his detective skills and his relationships.
There's no way to know for sure without reading the 'scars novel'. However, it might have a hero who has to deal with the stigma associated with their scars, whether they are from a battle, an accident, or something more personal. There could also be a sidekick character who helps the main character come to terms with their scars and move forward in life.
Harry Potter and Batman themselves are often combined. Fans like to see how the Boy Who Lived would interact with the Dark Knight. Hermione is also a popular character to bring into these crossovers. She could share her vast knowledge with Batman or use her magic to help him in his crime - fighting.
Batman himself is obviously very popular. His dark and brooding nature contrasts well with the more colorful X - Men world. Also, Wolverine is often a fan favorite in these crossovers because of his tough - guy attitude.
Obviously, Batman and Spider - Man themselves are very popular. But also, characters like Robin from Batman's side and Mary Jane from Spider - Man's side often make appearances. They can add a different dynamic to the story, whether it's a romantic sub - plot or a side - kick adventure.