One idea could be that the OC is a childhood friend of Bruce's who has a unique skill, like being an expert in ancient martial arts from a far - off land. They could influence Bruce's training and view on justice in a different way. For example, they might introduce him to more spiritual aspects of combat and self - discovery.
One possible fanfiction could be about Bruce's daughter growing up in the shadow of her father's legacy. She might struggle with the expectations placed on her and try to carve out her own identity. For example, she could have a different approach to fighting crime, perhaps focusing more on prevention through community work rather than donning a costume like Batman.
Bruce Wayne in Batman Begins fanfiction is often a complex character. He is a man on a journey of self - discovery and vengeance. In fanfiction, we might see different aspects of his training that were not fully explored in the movie. For example, his time with Ra's al Ghul could be delved into more deeply, showing his internal struggle between the teachings of the League of Shadows and his own moral code.
One of the most intriguing Bruce Wayne fanfiction stories in the Batman Begins universe is those that focus on his pre - Batman days. Stories that show his travels around the world, learning different fighting styles and philosophies. For instance, a story might detail his time in the Far East, training with martial arts masters and how that influenced his later combat techniques as Batman.
One interesting fanfiction could be about Bruce and Rachel's relationship before he fully becomes Batman. It might explore their shared past and how their feelings for each other developed during that time.
In Bruce and Selina's fanfiction, the 'soulmate' trope is quite prevalent. Despite their differences, they seem to understand each other on a deeper level that others can't. There's also the 'protective love' trope. Bruce, as Batman, will always want to protect Selina, even from herself sometimes. And the 'tug - of - war' between their two worlds. Bruce's world of law and order and Selina's world of chaos and freedom is constantly in play, and this struggle is a key part of their relationship in many fanfictions.
She could be a source of emotional support for Bruce. In the movie, Bruce is often alone in his journey, but with a sister, she could be there to comfort him during the tough times, like after his parents' death.
Their relationship could develop in many ways. For example, they could team up more often as allies against a greater threat in Gotham. This would strengthen their bond as they learn to trust each other more. Or, Selina could fully embrace the side of good and join Bruce in his fight for justice, becoming a more permanent part of his life.
One great Bruce x OC fanfiction might be the one where the OC is a detective who helps Bruce in his early days of uncovering Gotham's secrets. In this story, their relationship develops as they solve crimes together, with the OC bringing a fresh perspective to Bruce's mission.
She could be kidnapped by one of Batman's enemies to get to him. This would put Bruce in a difficult situation where he has to balance his need to save his daughter and his vow not to kill his enemies. It would also show her strength as she tries to escape on her own terms.