One great fem Lelouch time travel fanfiction is 'The Time - Traveling Empress'. It has an interesting plot where fem Lelouch uses her knowledge from the future to change the course of the story in a really engaging way.
Another theme is the exploration of power. Since Lelouch is a character associated with power in the original series, in time travel fanfictions, fem Lelouch might use her knowledge of the future to gain more power, or she might try to change how power is distributed. For example, she could prevent certain power - hungry characters from rising to prominence. And she may also learn about the true nature of power during her time - traveling experiences.
Time travel can greatly expand Lelouch's character development. When he travels back in time, he gets a second chance. This makes him more cautious as he doesn't want to repeat the same mistakes. For example, he might be more careful in his relationships with Suzaku and others, knowing how things turned out before.
One possible fanfiction could involve Lelouch traveling back in time and trying to change his relationship with Cornelia Nonette. Maybe he uses his knowledge from the future to prevent certain events that led to their conflict. For example, he could try to find a way to make her understand his motives earlier in the story, which might lead to an alliance between them instead of enmity.
One possible fanfiction could be where Lelouch time - travels back to a crucial moment in the story. With the help of Loyd's brilliant mind and Cecile's technical skills, they try to change the course of events for the better. Maybe they prevent a certain tragedy from occurring that originally had a huge impact on the story's development.
Another theme is the alteration of fate. Since he has the power of time travel, he can change the pre - determined paths of characters and events. This can lead to a whole new set of political and social situations in the story. It's really fascinating to see how the writers play with the idea of destiny.
Often, in these fanfictions, the exploration of the characters' motives is crucial. Lelouch's desire to protect Nunnally may drive his actions in the time - travel scenarios even more strongly. Also, the concept of fate is played with. They might be trying to break free from a pre - determined fate that was set in the original story.
There is a fanfic called 'Lelouch's Time Travel Adventure'. In it, Lelouch travels back in time to a point before the start of the series. He uses his knowledge of the future to try and prevent the events that led to the sad state of the world in the original story. It has some really cool moments where he outsmarts his enemies using future knowledge, and the way the author writes his internal monologues is very interesting, making it a great read for Code Geass fans.
There's a fanfic called 'Journey Through Time with Lelouch and Nunnally'. In this one, they are sent back in time by a mysterious force. Lelouch uses his intelligence to navigate the past while protecting Nunnally. It's full of exciting plot twists and emotional moments as they rewrite their destinies.