Obi - Wan Kenobi could be a great travel companion. Their relationship is so complex, and Obi - Wan could either be there to guide Anakin or to try and stop him from changing too much. Another possibility is Padmé. Since she was such an important part of Anakin's life, she could accompany him and influence his decisions during the time travel adventures.
Luke Skywalker might be an interesting choice as a travel companion. He could be the one to show Anakin the future he created as Vader and then help him find a way to fix things. Or it could be Qui - Gon Jinn. Qui - Gon was always a bit of an outlier in the Jedi Order, and his different views could be useful in guiding Anakin during time travel.
Darth Vader could be an unexpected ally in a time travel scenario. If Luke travels to a time when Vader was still Anakin Skywalker and on the verge of turning to the dark side, Luke could try to prevent his fall. In the process, Anakin might become an ally, using his skills as a powerful Jedi to help Luke in whatever mission he has in that time period.
In a time - travel scenario, Anakin's relationship with his mother could be greatly altered. He could go back in time and save her from the Tusken Raiders. This would change his whole outlook on life and his path towards the dark side. Regarding his relationship with Palpatine, he would be aware of Palpatine's true nature from the start. So, he could either avoid Palpatine completely or try to expose him earlier. His relationship with other Jedi, like Ahsoka, could also be different. He could be a better teacher and mentor to her, as he has the experience of his future mistakes.
Some fanfics might have Anakin time travel to a time when the Jedi Order was first founded. He could learn from the ancient Jedi teachings and bring that knowledge back to his own time to reform the Order. Or he could travel to a post - Galactic Empire era, seeing a galaxy that has either recovered or is still in chaos from his actions as Vader, which would be a huge motivation for him to go back and change things.
Naruto would be an ideal time - travel companion for Sasuke. They have a complex relationship and Naruto's positive attitude and determination could balance out Sasuke's more brooding nature. Naruto could also offer different perspectives on how to handle situations in the past. Plus, their combined skills would be a force to be reckoned with in any time period.
One possibility is that Lin's mentor could be his time - traveling companion. His mentor could share wisdom from different eras and help Lin make sense of the historical and cultural contexts he encounters. Another could be a time - traveling historian. This person would have in - depth knowledge about the various time periods, which would be really useful. Also, it could be a magical creature in a more fantastical version of the fanfiction. Like a talking cat that has the power to travel through time and acts as Lin's guide and friend.
His relationship with Obi - Wan would also change. If Anakin travels to a time when he was just a young Padawan again, Obi - Wan might see a different side of him. Anakin could use his future knowledge to become a better student, and Obi - Wan would be proud of him. Or, if Anakin travels to a time before he met Obi - Wan, he could approach their relationship from a new perspective when they do eventually meet.
One idea could be Anakin traveling back in time to prevent his fall to the dark side. He could use his knowledge of the future to avoid the events that led him astray, like not trusting Palpatine. Another plot could involve him traveling to a time after his death and seeing the impact of his actions on the galaxy, which could be a moment of redemption for him. And perhaps he travels to a completely different era in the Star Wars universe and has to adapt to new cultures and powers while also dealing with his own inner turmoil.
One common theme is redemption. Since Anakin made so many mistakes in the original story, in time travel fics, he often tries to atone for his actions and make things right. For example, he might go back to save Padmé or prevent the rise of the Empire.
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.
Anakin could be the key to changing the future. His power in the Force might be used to correct the mistakes he made in his original timeline. Padame would be the moral compass, ensuring that their actions are for the good of the galaxy. Musfar might be the one who discovers the method of time travel and brings them along. He could be a scientist or a Force - sensitive with unique abilities.