There could be a young and idealistic clone in the 501st. He is new to the unit but has learned a lot about the Jedi's values and the importance of their alliance. When Order 66 is issued, his inexperience with the Clone Wars' politics and his pure heart make him the first to oppose the order, and gradually he convinces others in the 501st to do the same.
A clone trooper from the 501st could be a main character. Maybe a sergeant who has a strong sense of justice and starts to question the orders they receive. He could be the one to rally his fellow clones to disobey Order 66.
A Jedi who has a special bond with the 501st could also be a main character. This Jedi might have trained some of the clones or has fought side - by - side with them for a long time. Their presence could be the reason why the 501st decides to disobey Order 66.
The plot could involve the 501st discovering a conspiracy behind Order 66. They might start to question why they are being ordered to kill the Jedi, who have been their comrades in arms. They could find evidence that the Sith are manipulating the situation for their own gain, and thus choose to disobey the order to prevent the destruction of the Jedi Order and the imbalance it would cause in the galaxy.
A clone medic could be a main character. He has spent a lot of time treating both clones and Jedi, and he realizes that the Jedi are not the enemies they are made out to be in the lead - up to Order 66. Alongside him could be a female Jedi knight who is a skilled fighter and diplomat. She uses her skills to try and persuade other clones to disobey the order. And perhaps there's a clone who was experimented on and has enhanced abilities, and he becomes a crucial part of their resistance against Order 66.
The plot might involve a clone who has a unique experience that makes him realize the wrongness of Order 66. For example, he could have been saved by a Jedi in the past. This clone then convinces other clones around him to disobey. They might join forces with some remaining Jedi and form a resistance against the new regime that's trying to take over after the purge of the Jedi. It could be a story full of action, as they fight against the forces that still support the execution of Order 66.
Captain Rex is often a likely candidate in fanfiction. He has a very close relationship with Ahsoka Tano and has seen the good in the Jedi through her. His loyalty to her might make him more likely to disobey. Another could be Commander Cody, if in a different scenario where he has more time to think about the implications of the order rather than blindly following it. He has worked closely with Obi - Wan Kenobi and might come to realize that the order is wrong.
Jon Snow could be a young journalist trying to uncover the truth about the corrupt power dynamics in the city. He's an idealist, much like in the original, and he's not afraid to take on the powerful families who control the media and politics.
An old Clone Wars veteran, either a clone or a non - Jedi military figure, could be the main character. They have seen the destruction of Order 66 and now suspect there is more to the story with Order 67. Their knowledge of the past wars and military strategies would be useful in uncovering the truth.
Obviously, the main characters from 'the order' could be the main characters in this fanfiction. They are the ones who would be traveling to the future or interacting with future elements.
There could be a combination of old and new members. The old members with their deep knowledge of the order's history and magic, and the new members with their adaptability. Together, they can face the challenges of the future, learn from each other, and perhaps change the future as well as the order itself for the better.
Another possibility is that Sakura could be involved. She might be curious about the magic in the Order of the Phoenix's world and try to learn from them. And on the Order of the Phoenix's side, Lupin could be a main character. He could share his knowledge of magic with Naruto and his friends, while also learning about ninja techniques from them. This would create a rich tapestry of characters and interactions within the fanfiction.
The main characters could be a group of bounty hunters. They get hired to investigate the origin of Order 69, thinking it might lead to a big payday. As they dig deeper, they find themselves in the middle of a galactic conspiracy. There could also be a Sith apprentice who is using the chaos caused by the order to rise in power within the Sith hierarchy.