An interesting Clone Wars OC fanfiction could focus on an OC who is a Sith apprentice in hiding. They could be manipulating events from the shadows, trying to gain power for themselves. Another option is an OC who is a bounty hunter hired by the Separatists to hunt down important Republic figures. And there could be an OC who is a mechanic for the Republic ships, and they end up inventing a new technology that gives the Republic an edge in the war.
Well, you could have an OC that is a smuggler who gets caught up in the Clone Wars. They might start off just trying to make a profit but end up having to choose sides. Or an OC who is a medical droid technician, and through their work, they discover a new way to heal clone troopers faster. Also, an OC who is a youngling that has to go on a secret mission during the Clone Wars to protect an important Jedi artifact.
She could be a clone who rebels against the clone programming. Instead of blindly following orders, she starts to question the morality of the Clone Wars. She might try to find a way to end the war peacefully, even if it means going against her own side. This would create a lot of internal conflict as well as external conflict with her superiors and comrades.
One idea could be creating an OC who is a Jedi with a unique lightsaber form that combines different traditional forms in unexpected ways. For example, a form that mixes Ataru's acrobatics with Makashi's precision. Another idea is an OC bounty hunter who has a moral code that often puts them at odds with other bounty hunters in the Clone Wars universe. They might refuse certain jobs that involve excessive violence or harm to innocents. Also, an OC clone trooper with a special talent like being an amazing artist, using the limited resources on the battlefield to create art that gives hope and a sense of normalcy to his fellow troopers.
A possible story idea could be that your OC Sith discovers an ancient Sith prophecy. They believe it will lead them to ultimate power. So, they start a quest to find the artifacts related to this prophecy during the Clone Wars. This could involve them infiltrating Jedi strongholds and causing chaos.
One plot idea could be that the OC is a secret agent working for the Republic and is assigned to protect Riyo Chuchi during a crucial diplomatic mission. Along the way, they face attacks from Separatist assassins and have to use their wits and skills to keep her safe.
One possible fem clone OC could be a highly skilled sniper. In fanfiction, she might have unique markings on her armor that distinguish her from the male clones. She could befriend some of the Jedi, like Ahsoka Tano, and together they face various challenges during the Clone Wars.
One idea could be exploring the backstories of minor clone troopers. For example, showing their training and how they form unique bonds within their squads.
A really cool concept could be a group of bounty hunters getting involved in the Clone Wars Zombies scenario. They could be after a valuable item in the middle of the zombie - infested area and have to fight their way through both the zombies and the clone troopers or other warring factions.
Perhaps a fanfiction where a group of gamers create their own custom clone units in the game and then those units somehow become real in the Star Wars universe. They then have to train and lead these unique clones in battles.
For a Star Wars Clone Wars crossover fanfiction, you could explore the idea of a group of Mandalorians from different time periods coming together during the Clone Wars. They might have different views on the war and the Jedi. Some could be more traditional, while others might be influenced by the changing politics of the galaxy. Their presence could add a new layer of conflict and intrigue. They could interact with Clone Troopers, Jedi, and even the Sith in unexpected ways, leading to some epic battles and character - development moments.
One idea could be to cross it with another sci - fi universe like Star Trek. Imagine the Jedi and the Federation crew working together. Another could be a crossover with the Transformers universe, where the clones team up with the Autobots to fight a common enemy. Maybe also a crossover with the Mass Effect universe, with the clones and Shepard's crew sharing combat strategies.