Well, if Anakin stops Order 66 in the fanfic, it would mean that the Clone Troopers wouldn't turn on the Jedi. Anakin might have a change of heart after realizing the full implications of what Palpatine was asking him to do. He could then warn the Jedi Council. This would completely change the course of the Star Wars saga. The relationship between the Jedi, the clones, and the Republic would be very different, and there would be a whole new set of stories to tell about their future together.
The Jedi would be the most directly affected. They wouldn't be massacred, and their order could continue to thrive. Also, the clones would be affected as they wouldn't have to carry out the unjust order. And of course, Anakin himself would be on a different path, likely seen as a hero rather than a villain. Padmé might also be affected as she wouldn't have to witness Anakin's fall to the dark side.
Well, in the fanfic, Anakin's skills would be a huge asset or a threat to the First Order. If he decides to join them, his combat abilities and knowledge of the Force could make the First Order even more powerful. However, if he realizes that they are on a wrong path, like the Sith - influenced path he once walked, he might use his skills to undermine the First Order from within. He could start by influencing the stormtroopers, showing them that there are other ways than blind obedience.
Well, he could either try to take over the First Order with his powerful Force abilities. Maybe he would see it as a new tool to gain more power and control in the galaxy.
Well, Padme could try to fight Anakin to stop him from further embracing the dark side. She might use her diplomatic skills and love for him as weapons. For example, she could tell him how their unborn child would grow up without a father if he continued down this path.
They might be shocked by the advanced technology. The future could have flying cars and huge skyscrapers everywhere. Anakin's Jedi skills might be seen in a new light, and Padme could be amazed at how society has evolved in terms of equality and governance.
In many fanfics, Anakin's betrayal by the Jedi could be due to a sense of being marginalized. The Jedi Council often treated him with suspicion because of his age and his strong connection to the Force. They didn't fully trust him and this made Anakin feel isolated. For example, they didn't grant him the rank of Master, which he felt he deserved. This sense of being undervalued could be a significant factor leading to his betrayal in fanfics.
In a time - travel fanfic, the twins might find themselves in a situation where they have to convince Anakin to leave the Jedi Order before Palpatine can manipulate him. They could take Padame with them and start a new life away from the chaos of the Clone Wars. This would create a whole new set of adventures and challenges for them, as they'd be on the run from both the Jedi and the Sith. They could use their combined powers to protect themselves and maybe even find a way to defeat the Sith once and for all without Anakin turning into Darth Vader.
Well, when time stops, people might freeze in place and the world could become chaotic. Everything would just come to a standstill.
Well, perhaps they would share their dreams and hopes for the future. They might talk about how they will face the challenges ahead together. Since they come from different worlds, they could also exchange stories about their childhoods.
Well, he might be given a dangerous mission. Maybe he has to infiltrate a Death Eater stronghold or protect a crucial magical artifact.