In many fanfictions, Obi - Wan might use his deep knowledge of the Force. He could reach out to Anakin through a Force - bond, calming his inner turmoil and guiding him away from the dark side. For example, he might remind Anakin of their past together, their training, and the values they once held dear.
Well, 'The Unspoken Understanding' is a must - read 'anakin obi wan fanfiction'. It focuses on the unsaid emotions and the silent communication between the two. It beautifully portrays their friendship and the trust that was once there. Also, 'Anakin and Obi - Wan: Parallel Journeys' is really good as it shows their individual growth while still being connected to each other.
Perhaps Obi - Wan uses his Jedi skills in a creative way. For example, he could use a Force - related technique that shields Anakin from the influence of the Sith. He might create a sort of Force barrier around Anakin's mind, preventing the dark whispers from corrupting him further.
In many Obi - Wan and Anakin fanfictions, the theme of mentorship is key. Obi - Wan's role as Anakin's teacher and guide is central. Also, the idea of destiny plays a part. Whether they can fulfill their destinies together or separately is a common plot point. Additionally, the theme of sacrifice is present, as both characters are in a position where they may have to sacrifice for the greater good or for each other.
The struggle between the light and dark side is also common. Since we know Anakin's fate, fanfictions often play with the idea of Obi - Wan trying to keep Anakin on the path of the light. It's about the internal and external battles they face in relation to the Force.
Maybe the Force itself could be an antagonist in a sense. The light side of the Force would be trying to pull Obi - Wan back from the dark side. And the natural balance of the Force that doesn't want too much dark side influence could be working against Anakin's plan to turn Obi - Wan. So the Force, in its own way, could be the main antagonist.
A great fanfiction is 'The Trials of Obi - Wan and Anakin'. It's about them going through a series of difficult trials that test not only their skills but also their relationship. There's also 'Light in the Darkness' which is a story where Anakin is on the verge of turning but Obi - Wan manages to pull him back. It's very well - written with great character development. And 'The Alliance of the Jedi' where Obi - Wan and Anakin form a stronger alliance than ever to face a new threat to the galaxy.
One common theme is loyalty. Their love is often intertwined with their loyalty to each other as Jedi. For example, in many fanfictions, they will put each other's safety above their own due to their love. Another theme is sacrifice. They might be willing to sacrifice their own standing in the Jedi Order for the sake of their relationship.
A major theme is growth and development. As they interact, they both grow as characters. For example, Anakin may learn more self - control from Fem Obi - Wan, and she may become more open - minded because of him. Also, the theme of loyalty is often present. They are loyal to the Jedi Order, but also to each other, which can create some complex situations.