One possible plot could be that as a female, Billy (let's call her Billie now) discovers new aspects of the Shazam powers. Maybe she has a different approach to using the powers for good in Fawcett City. She might face unique challenges from the villains who are not used to a female Shazam. For example, they might underestimate her at first, but she quickly proves them wrong with her newfound strength and the wisdom of Solomon which she uses in a more empathetic way as a female.
The relationship with her foster family might change. They could be more protective of her as a female, or she might have to prove herself in a different way. Her interactions with the villains would also be different. They might target her differently, like using more psychological attacks based on her gender. For example, they might try to make her doubt her abilities as a female superhero.
Their relationship might start off a bit rocky. Batman is used to working alone and Billy is a free - spirited kid. But over time, Batman's strict discipline could help Billy focus his powers better. Billy, on the other hand, could show Batman that there's more to life than just fighting crime in the shadows. They'd gradually develop a deep bond of trust and respect for each other.
Billy Batson's memories in fanfic can add depth to his character. For example, his memories of facing difficulties before getting his powers can make readers understand his growth better. Maybe he had memories of being bullied at school or feeling lonely at home. These memories, when explored in fanfic, can create a more relatable and three - dimensional character.
I'm not sure if there is a specific, well - known 'Billy Batson is Batman's son' fanfiction, but in the world of fanfiction, anything is possible. Some fanfictions might be part of a larger crossover universe where different superhero properties are mashed up. This particular concept could lead to some really interesting storylines, like how Billy would deal with Batman's strict code, or how Batman would handle having a super - powered son who also has a very different personality compared to his usual sidekicks.
One great Billy Batson fanfic could be 'The Adventures of Billy Batson Beyond'. It explores new powers that Billy might gain. Another is 'Billy Batson: The Lost Years' which delves into his past before becoming Shazam. There's also 'Billy Batson and the New Allies' where he teams up with other heroes.
The theme of redemption can also be found in some billy batson fanfiction. Sometimes there are characters who have made mistakes in the past and Billy helps them find a path to redemption. Additionally, the exploration of the magical world that gives Billy his powers is a common theme. Writers often expand on the magic, its rules, and its history in their fanfictions.
Another place could be FanFiction.net. There are many fans who post their creative works there. However, the quality and content can vary widely. You might have to dig a bit through different categories related to the DC universe to find the specific fanfics about these two characters.