In many Star Wars fanfics, the relationship between Leia, Anakin, and the concept of a 'ghost' can be really interesting. Leia is Anakin's daughter, and in some fanfics, Anakin's ghost might play a role in guiding or protecting her. For example, he could appear to her at a crucial moment, sharing some wisdom from the Force that helps her make a difficult decision. This could add a new layer of depth to their family connection that wasn't fully explored in the movies.
In anakin force ghost fanfic, the theme of hope is often present. His existence as a Force Ghost gives hope to those who are still fighting for good. Another common theme is the exploration of the Force. As a Force Ghost, Anakin has a deeper understanding of the Force, and fanfics often use this to explore different aspects of the Force. There's also the theme of forgiveness. Anakin has to seek forgiveness from those he wronged, and this journey of seeking forgiveness is a common plot in many fanfics.
There are fanfics where the ghost of Anakin is a catalyst for Leia's growth. Leia, who has always been strong - willed and independent, is faced with the presence of her father's ghost. At first, she might be angry or confused. But as she interacts with the ghost, she starts to understand the power of forgiveness and redemption. Anakin's ghost can represent the cycle of life, death, and rebirth in the Force. His presence can help Leia see that there's more to the Force than just the light and dark sides, and this new understanding can transform her in many ways.
To keep Anakin's character true, writers pay attention to his relationship with the Force. His connection to the light and dark side is crucial. In a crossover, if he's in a world without the Force as we know it, his struggle to understand this new power - less world while still having his internal Force - related battles is a way to stay true to his character. For instance, if he crosses into a world of technology, he might be frustrated by the lack of a spiritual power like the Force and try to find equivalents.
One great Anakin Force Ghost fanfic is 'The Redemption of Anakin Skywalker in the Afterlife'. It delves into how Anakin, as a Force Ghost, tries to right his past wrongs in the spiritual realm. Another is 'Anakin's Guidance', where he appears as a Force Ghost to guide a young Jedi. There's also 'Force Ghost Anakin: A New Hope', which shows Anakin using his spectral form to influence the future of the galaxy for the better.
There could be a hermit or an outcast Jedi or Sith on Dathomir. Anakin meeting this character could lead to a great revelation. Maybe this character has been in hiding on Dathomir for years, observing the balance of the Force there, and Anakin's arrival disrupts that balance and forces an interaction that changes Anakin's perspective on many things.
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.
Anakin could be angry. He might see his other self as a threat, especially if one represents his dark side and the other his light side. There could be a power struggle between the two versions of himself as they try to assert dominance over the other. Or he could be curious and eager to learn from his other self, about what he could have been or what he can still become.
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.
I'm not sure specifically as there are many original ghost stories. It could involve things like a haunted house, a spooky apparition, and a character trying to solve the mystery behind the hauntings.