A fanfic about an OC who is a commoner in the Britannian Empire but discovers they have a connection to an ancient and powerful artifact. This connection leads them to become involved in the power struggles between the different factions in the Code Geass world, as everyone wants to get their hands on the artifact.
An OC with a unique Geass power, like the ability to manipulate time on a small scale. For example, they could slow down time for a few seconds to gain an advantage in combat or to escape dangerous situations. This would add a new dynamic to the battles and strategies in the Code Geass universe.
One idea could be an OC who is a commoner but has a unique power that gets noticed by Lelouch. For example, the ability to manipulate sound waves which could be used for both stealth and attack. Another could be an OC from a foreign nation who has different moral and cultural values than the Britannians and Japanese, creating interesting conflicts. Or an OC who is a brilliant scientist working on a secret project that could change the balance of power in the Code Geass world.
One idea could be to create an OC who is a spy during the Marianne affair. This OC could be secretly working for a third party, trying to uncover the truth behind the events. They could have unique abilities like enhanced stealth or the power to read people's emotions, which would help them in their investigation.
One idea could be a crossover with 'Fullmetal Alchemist'. Picture Lelouch using his Geass to manipulate the Homunculi in some way. Another could be a crossover with 'Attack on Titan', where the Geass power might play a role in dealing with the Titans. Maybe Lelouch could use his Geass to control some of the Titans and turn the tide of battle.
One idea could be exploring an alternate universe where Shinkiro has different abilities or a different origin story. For example, what if Shinkiro was created by a different group with a different purpose in mind.
Maybe a harem fanfic where Lelouch's Geass power has an unexpected side effect on the girls around him. Instead of just making them obey a single command, it creates a strong emotional bond that leads to the harem situation. The story could then explore how Lelouch deals with these new relationships while still trying to achieve his main goals in the Code Geass universe.
The OC could be a time - traveler who lands in the Code Geass world and meets the prince. As she tries to find her way back home, she accidentally creates a harem situation. There could be a knight who is sworn to protect the prince and starts to have feelings for the OC because of her strange knowledge from the future, and a foreign princess who sees the OC as a way to form an alliance with the prince.
A possible plot is the OC having a Geass that allows him to understand and communicate with all forms of life. This would make him very interesting to the different factions in Code Geass. The Britannian royalty might want to use him for political gain, while the resistance groups see him as a potential ally. Along the way, he forms a harem of characters from both sides who are drawn to his unique ability and kind heart.
One idea could be an OC who has the power to manipulate time in a limited way. They could use this power to try and prevent certain tragedies in the Code Geass world, like the fall of certain regions. Another plot could involve an OC who is a master strategist from a different universe and has to adapt their skills to the complex politics of Code Geass. A third idea might be an OC who can communicate with machines, which could lead to some really unique interactions with the mechs in the series.
In 'Code Geass Villetta OC Fanfic', the creativity of the fans really shines. Since it's fan - made, writers can take the world of Villetta and add their own twists. They can give OCs special abilities or backstories that tie into the complex world of Code Geass. It's also interesting to see how different writers interpret the politics, society, and culture of Villetta in their own ways. This can make the fanfics feel like new adventures within the familiar Code Geass universe. Moreover, the exploration of uncharted areas of the Villetta world through these OCs can be really engaging.
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.