Joffrey was a cruel character. It's hard to imagine a traditional love story for him. His nature was so malicious that any form of love seemed out of place. He was more interested in power and causing pain. So, in the context of the show, a real love story for him seems almost impossible.
There could be a really interesting fanfic where a Dragonborn enters the world of Game of Thrones during Joffrey's reign. Maybe the Dragonborn would initially be seen as a threat by Joffrey. But the Dragonborn's powers could change the power dynamics in King's Landing. For example, if the Dragonborn has the ability to control dragons, it would be a huge advantage over the Lannisters who rely mainly on their wealth and military might at that time.
In the context of the fanfic, the Dragonborn's presence could also expose Joffrey's weaknesses more clearly. The people of Westeros, seeing someone with such great power (the Dragonborn) who is not as cruel as Joffrey, might be more inspired to rise up against Joffrey. And Joffrey's own allies might start to question their loyalty to him when they see the Dragonborn as a potential new power player in the game of thrones.
One possible fanfiction could be about Joffrey's brother Tommen growing into a wise and just ruler. He could be shown learning from the mistakes of his older brother. He might start secretly training in combat and political strategy, with the help of some of the more noble characters in the series, like Tyrion perhaps. He could then start to make changes in King's Landing, trying to reverse the chaos that Joffrey had caused.
Joffrey is often characterized as even more cruel and unhinged in fanfiction. His violent outbursts and lack of mercy are sometimes exaggerated. Margaery is usually shown as a very intelligent and manipulative woman. She uses her beauty and charm to her advantage.
There are some really interesting fanfics out there that combine the concepts of a Dragonborn in the Game of Thrones universe with Joffrey. One I've read had the Dragonborn as a sort of mysterious figure who arrives in King's Landing during Joffrey's reign. The Dragonborn's presence throws the power dynamics into chaos as they have their own set of powers and motives. It was really fascinating to see how the author played with the different personalities and politics of the Game of Thrones world in that fanfic.
In some fanfictions, Joffrey is re - imagined as a more sympathetic character. His cruel actions are often explained as a result of his upbringing and the political pressures around him.
In the novels, Bran's story is still ongoing. He has been on a journey of self - discovery and developing his powers. He has faced many challenges and adventures, but death has not befallen him yet. His character arc is quite complex and important to the overall story, so it's likely that his story will continue to unfold in future installments of the novels without him dying just yet.
Bran Stark remains alive throughout the Game of Thrones novels. The author has chosen to keep him as an important character with a continuing role and purpose.