It could be a new and powerful dark side user. This character might have emerged from the shadows, having trained in secret, and their sole purpose is to take down Anakin as he is seen as a threat to their plans for galactic domination.
Anakin could encounter future versions of his friends or enemies from the past. For instance, he could run into a future version of Obi - Wan Kenobi who has also somehow traveled to that future time. Or perhaps he meets a new generation of Sith who have different motives and methods compared to the Sith he knew in his own time. They could challenge his understanding of the dark side and the Force in general.
In fanfiction, one possible way could be out of jealousy or being corrupted by the dark side. If Anakin felt that Obi - Wan's child was a threat to his power or position in the Jedi Order, he might be driven to kill. But this goes against his character in the original canon to a large extent.
Yes, in many fanfics Anakin is often depicted as an extremely skilled pilot. His natural talent and Force - enhanced reflexes give him an edge in the cockpit, making him a formidable force in space battles.
One great aspect of Anakin in Clone Wars fanfiction is his complex character development. Fanfic writers often explore his internal struggle between the light and dark sides more deeply. For example, they might create scenarios where Anakin has to make difficult choices earlier in the Clone Wars timeline than in the official story, which adds more tension and drama to his character arc.
Naruto might approach it with his typical bravado. He would just charge in, relying on his Juubi - enhanced powers. He'd probably start with a big display of power to intimidate those who are threatening Anakin.
Anakin might develop more self - control earlier. Yoda's wisdom and unique training style could help him better understand his emotions and not be so easily swayed by fear, which was a major factor in his fall to the dark side in the original story.
If that were the case, the galaxy's fate would likely have been very different. Maybe they could have avoided the conflicts and tragedies that came with Anakin's Jedi path. But who knows how other forces would have shaped events without the Jedi's influence.
One possible different master for Anakin in fanfic could be Qui - Gon Jinn. Qui - Gon was always one to follow his instincts and was more in tune with the Living Force. He might have been able to handle Anakin's powerful emotions better than Obi - Wan. He was also more willing to question the Jedi Council, which could have influenced Anakin in a positive way, making him less likely to feel oppressed by the Council's rules.