In this fanfiction, Anakin could interact with the spirit of Yoda. Yoda has a connection to both Anakin and the events in 'The Last Jedi'. Their exchange could be really interesting as Yoda has his own wisdom to impart and Anakin has his own experiences. Also, Anakin might interact with Leia. He knew her well in his own time, and in 'The Last Jedi' she is still an important figure. He could be proud of her leadership in the Resistance or have some concerns about the path she's leading her people on.
Well, one interesting aspect could be how Anakin's perspective from his own era in the Star Wars universe clashes with the events in 'The Last Jedi'. Maybe he would be critical of some of the new characters' actions, like how Luke is portrayed in that movie. It could also be fascinating to see his reaction to the new Force abilities and concepts introduced in 'The Last Jedi' through the eyes of this fanfiction.
He could interact with Luke Skywalker. Imagine Anakin finally getting to meet his son as an ally in the Rebellion. They could train together and share their knowledge of the Force.
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.
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.
He could face Sith Lords. They are always a big threat to the Jedi Temple.
The main characters would surely be Anakin Skywalker and Count Dooku. Anakin is the protagonist in a sense as we would see his development through Dooku's training. Dooku, on the other hand, is the one who imparts his knowledge and skills, and his character would also be explored in terms of his motives for training Anakin.
Obviously, Anakin Skywalker and Revan. Anakin is the one being trained, so he will be a central figure. His growth and development under Revan's tutelage will be a major focus.
In addition to Naruto and Anakin, the fanfiction might introduce some Naruto - universe characters into the Star Wars setting. For example, Sasuke could show up. His rivalry with Naruto could translate into some sort of conflict or cooperation in the new universe. And of course, the Sith Lords would be there as the antagonists. They would be interested in Anakin's potential, and Naruto would have to protect his son from their influence.
Often, their interactions start from a place of conflict. Anakin's past actions as Vader create a barrier. However, as the story progresses, they may start to understand each other more. For example, Anakin could reveal his true self to Leia, the self that was once a good Jedi. This could lead to moments of deep connection and mutual respect between them. They might also have to work together against a common enemy, which would force them to communicate and cooperate, leading to a more developed relationship.
In many fanfictions, Anakin's betrayal by the Jedi Council is often depicted as a complex web of misunderstandings and power plays. One common take is that the Council's secrecy and lack of trust in Anakin, especially regarding his relationship with Padmé, pushed him towards the dark side. They constantly held him at arm's length, not fully accepting him despite his great power.