Maybe Arabella discovers Bruce's plan to become Batman before he's fully committed to it. She tries to talk him out of it, fearing for his safety, but eventually realizes it's his destiny and decides to support him in a more behind - the - scenes role, like managing his finances for his vigilante activities.
In a fanfiction, Arabella could have her own set of enemies. These enemies could target her to get to Bruce. Bruce then has to balance his new life as Batman with protecting his sister, leading to some intense and emotional scenes between them.
Perhaps in the fanfiction, Bruce's sister could have her own set of skills. For example, she could be a brilliant scientist who helps Bruce develop some of his gadgets for Batman. She might be the one who figures out how to make the Batmobile more efficient or the Batsuit more durable.
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.
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.
Arabella could also be a bit of an outcast in Gotham society, much like Bruce. However, instead of turning to vigilantism, she focuses on using her family's wealth to start charitable organizations that help the less fortunate in Gotham. In the fanfiction, she could be a source of moral guidance for Bruce.
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 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.
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.
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 idea could be that Batman, in his quest to fight crime in Gotham, discovers some sort of interdimensional rift that leads him to the world of The Avengers. He then has to team up with them to stop a common enemy that is using technology from both universes to cause chaos. For example, Loki could be teaming up with some of Batman's rogues gallery like The Riddler to create complex puzzles and illusions that are both magical and technological in nature.
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.