In such a fanfiction, it could lead to some interesting plot twists and character developments. Maybe Goku's identity as Kakarot would be explored in a deeper and more complex way.
Goku could escape by overpowering Broly. He might tap into his Super Saiyan forms, like going into Super Saiyan Blue or even Ultra Instinct if he's pushed far enough. His sheer power and fighting skills could allow him to break free from whatever restraints Broly has put on him.
Sure. Fanfiction writers have a lot of creative freedom when it comes to Goku and Female Broly. In some fanfictions, they might be in a romantic relationship, which is an interesting take considering their Saiyan heritage and the way they both value strength. However, not all fanfictions take this route. Some might explore a more platonic friendship where they respect each other's power and learn from one another. You can usually find a variety of these stories by using the search function on major fanfiction platforms.
With his son Gohan, the relationship could be strained. Gohan has always looked up to Goku as a hero. But as Kakarot, Goku might push Gohan to be more like a traditional Saiyan, which could be too much for Gohan. Also, Vegeta's view of Goku would change. Vegeta has always seen Goku as a rival but also respects him. As Kakarot, Vegeta might see him more as a threat to the Saiyan way of life or as a potential ally in a more Saiyan - centered agenda.
One possibility is that Goku starts to remember more of his Saiyan past as Kakarot. Maybe he begins to have flashes of his original mission on Earth, which was to destroy it. This could create an internal conflict within him as he has grown to love Earth and its people. He might struggle with his identity, trying to reconcile the ruthless Saiyan warrior Kakarot was supposed to be with the kind - hearted Goku he has become.
One common theme is redemption. Since Broly is often portrayed as a villain initially, many fanfics focus on his journey towards redemption with Goku's help. For example, Goku might show Broly a different way of using his power, leading Broly to change his ways.
Well, a common theme is the exploration of Saiyan culture. Given that both Goku and Female Broly are Saiyans, fanfiction might delve into the traditions, values, and history of their race. Also, adventure themes are popular. They could go on quests across the universe, facing new threats and discovering unknown planets. Additionally, there's the theme of rivalry. They are both strong, so some fanfictions play up their competitive side, seeing who can be the stronger Saiyan in different challenges.
There are indeed some. I've come across a couple where the authors beautifully develop their relationship. They often play with the idea of how their different personalities, Goku's adventurous and friendly nature and Fem Broly's more complex, often misunderstood character, could come together in a romantic context. It's interesting to see how different writers approach this unique pairing.