In some fanfics, a great plotline is when Lelouch is forced to work undercover for Charels for a time. This would put him in a really difficult position, having to balance his own goals of overthrowing Britannia with the tasks Charels assigns him. He might have to make some really tough decisions that could either expose his true intentions or help him gain more power within the system.
Suzaku could be a main supporting character. His relationship with Lelouch is complex, and in a fanfic involving Charels, he might get caught in the middle of their power struggles. C.C. is also likely to be a key supporting character. She has her own goals and powers, and her influence on Lelouch would play an important part in the story.
Since the idea involves such a disturbing concept as rape, it should not be promoted. Fanfics are supposed to be creative works within the boundaries of legality and morality. There's no value in exploring the details of this kind of 'fanfic'.
I highly doubt it. Given the disturbing nature of the theme (if it involves rape as the title suggests), it's not likely to be popular among the general audience who prefer positive and ethical content.
One interesting plotline could be Lelouch having to deal with the aftermath of his 'death' being faked. Maybe he has to secretly guide the new world order he created without revealing his true identity. Another could be his relationships with the other characters, like how he reconnects with C.C. in a new and different way.
The creativity in 'All Hail Lelouch' fanfic is really appealing. Writers can introduce new characters that fit seamlessly into the existing world. These new characters can bring fresh perspectives and storylines. Moreover, the fanfic can focus on the psychological aspects of Lelouch. Since he is such a complex character, fanfic can explore his inner thoughts and feelings more in - depth. It gives readers a chance to see different sides of him that might not have been fully explored in the original series. Additionally, the fanfic might explore how the events of the series impact the world on a larger scale, such as the political and social changes.
For a 'Code Geass Lelouch Ressurrection' fanfic, a great concept would be to set it in an alternate universe where the resurrection has some unforeseen consequences. For instance, the balance of power in the world has completely shifted. Lelouch has to navigate this new world order while also dealing with his own internal struggles about his identity and purpose.
Another plotline might be a 'what if' scenario where Bella had different powers or abilities. This could change the dynamics of her relationships with Edward and the other vampires and werewolves.
One interesting lelouch fanfiction could be the ones that explore an alternate universe where Lelouch doesn't die. It gives a whole new perspective on his character development and how he would interact with the world and other characters in a different scenario.
One possible plotline could be the challenges they face in their relationship due to the unexpected pregnancy. Maybe they have to deal with family reactions or difficulties in their own relationship because of this new situation.
A possible plotline could be that a lemon grove is the secret meeting place for C.C. and Lelouch. They use the cover of the grove to plan their next moves against their enemies. It's a place where they can be themselves and strategize without fear of being overheard.