Yoda would be another character. As one of the wisest Jedi, he could sense the strange situation with Anakin and offer his unique perspective. He might be more patient with a child - like Anakin, teaching him important Jedi lessons and trying to ensure that Anakin doesn't go down the same dark path as he did in the original timeline.
Obviously, Anakin himself is the central character. Luke would also be a major figure as he would be interacting with his father in a different way than in the original ending. Leia might also play a significant role, perhaps struggling to accept her father's new existence and having to come to terms with her own connection to the Force through him.
Anakin's mother, Shmi, would likely be a very important character. Since Anakin is not being trained as a Jedi, he would be more focused on his family. Shmi's influence on Anakin would be even greater, and she could play a role in guiding his actions and decisions, especially in relation to the local community on Tatooine.
Obi - Wan Kenobi would be one. He's Anakin's master, and in the fanfiction, he might suspect something about their relationship and have to decide whether to support them or uphold the Jedi Code.
One possible plotline could be Anakin having to re - learn the ways of the Force as a child while also dealing with his past memories. Another might be how the other Jedi react to this de - aged Anakin, whether with suspicion or a sense of protectiveness.
His mother, Shmi, would definitely be a main character. She could play an even more important role in Anakin's life, guiding him in using his abilities for the good of Tatooine. Also, Watto, the junk dealer, could be a significant character. Their relationship might evolve from one of slave - owner and slave to something more complex, like a grudging friendship or a business partnership as Anakin grows older and more skilled.
Sometimes, other famous musicians from his era or even later eras might be included. They could be shown as friends or rivals. For example, Prince could be written as a friendly competitor in the fanfiction, inspiring each other to create better music.
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.
Padmé is often paired with Anakin in fanfiction. Even though he has turned to the Sith, their love story still has a lot of potential for exploration. Writers might create scenarios where Padmé tries to bring Anakin back from the dark side. Another popular character is Obi - Wan. Their relationship as master and apprentice can be further developed in the context of Anakin's Sith journey. There could be intense confrontations or moments of reluctant understanding between them.
Hermione is often involved. She might help Harry understand the complex magic associated with the Elder Wand. For example, she could research in the library to find out any hidden lore about the wand.
Obviously, he would interact with his younger self. He could try to guide his younger self, offer advice on how to control the Force better and how to deal with the temptations of the Dark Side.