The Padawan could be a young alien from a species not often seen in the Jedi order. Maybe an amphibious species that has a different way of sensing the Force due to their unique physiology. This would make for an interesting dynamic as Anakin would have to adapt his teaching methods.
Another theme is his relationships. Fanfics often focus on his bond with his master, like Obi - Wan, and how that relationship shapes him. Also, his friendships or rivalries with other Padawans are frequently explored.
Anakin Skywalker's story is one of great tragedy. Born into slavery, he had a difficult start. As a Jedi, he was in a relationship with Padmé Amidala, which was against the Jedi Code. His fall to the dark side was gradual. Palpatine manipulated him. He committed many atrocities as Darth Vader. But deep down, there was still good in him, which was shown when he sacrificed himself to destroy the Emperor.
One great 'Anakin Skywalker Fanfic' is 'The Chosen One's Redemption'. It shows Anakin's journey towards redemption in a really interesting way. It delves deep into his inner turmoil and how he tries to make up for his past mistakes.
There's also 'Anakin: The Padawan Years'. This fanfic focuses on his training and how he overcomes various challenges during that time. It's full of action scenes and character development, which makes it a great read.
Yes, in some fanfics, Anakin Skywalker is made out to be a descendant of Revan. Writers like to create these connections to add more depth and mystery to the Star Wars universe they're crafting in their stories.
One great Anakin Skywalker fanfic is 'The Fall and the Redemption'. It delves deep into Anakin's internal struggle between the light and dark side. Another is 'Anakin's Untold Journeys' which explores his relationships in a new light, especially with Obi - Wan. And 'Anakin: A Different Path' presents an alternate timeline for his character that is really interesting.
One idea could be a story where Anakin and Ahsoka are reunited after a long time apart. Maybe Anakin has been on a secret mission and Ahsoka has been exploring new parts of the galaxy. When they meet again, they have to work together to face a new threat that is endangering the Jedi Order.
There are some out there. However, the quality can vary greatly. Some might focus more on the romantic aspects between Anakin and the members of the harem, while others could be more action - packed with the harem aspect being a secondary plot. You really have to dig through different fanfic platforms to find the ones that suit your taste.
I really like the fanfic 'Anakin's Guidance for Rey'. In this story, Anakin, as a Force ghost, appears to Rey after she has started her Jedi training. He gives her advice on how to deal with the dark side of the Force, based on his own experiences. It has a lot of great dialogue and shows how Anakin has grown in his understanding of the Force even after his death.