Another way is to show a relationship full of regret. Anakin could be filled with remorse for how he treated Ahsoka in the past, but his dark side self still has the urge to do harm. Ahsoka, on the other hand, is conflicted between her love for the old Anakin and her need to oppose the current, dark Anakin.
Their relationship could be portrayed as more of a friendship at first. They start as comrades in the fight against the Separatists during the Clone Wars, and slowly their feelings develop. This would be a different take from the instant attraction in the movies.
Their relationship could be portrayed as more of a partnership in the Clone Wars. Instead of just a romantic couple, they could be shown as two people with different skillsets who are equally important in achieving victory. For example, Padme could be more involved in the military strategy discussions with Anakin, using her political knowledge.
Their relationship could be portrayed as more of a friendship. Instead of the typical toxic relationship, they could be shown as two outcasts who support each other in their own strange ways. For example, Harley helps the Joker with his plans not out of love in a romantic sense, but because she values their friendship.
Their relationship could be portrayed as a mentor - student kind of thing. Amy could be learning from Dark Super Sonic about the darker aspects of power and how to control it within herself. This would be a very different take from the usual romantic or friendly relationship.
In many Star Wars fanfictions involving Ahsoka and Anakin, their relationship is often explored in depth. Ahsoka was Anakin's apprentice, and fanfictions might delve into how their training sessions influenced their bond. For example, some fanfictions might show how Anakin's unorthodox teaching methods both inspired and challenged Ahsoka. This could lead to character growth for both of them, as they learned from each other's strengths and weaknesses.
Their relationship can be developed through shared experiences. For example, going through a difficult battle together and having to save each other's lives. This would create a stronger bond between them.
The relationship could be shown as a mentor - mentee type in some fanfictions. Maybe the Dark Lord, in an alternate reality, decides to teach Harry some of his dark magic knowledge not to corrupt him, but to make him stronger to face other threats in the wizarding world. This would completely change the dynamic between them. They could also be shown as reluctant allies, forced to work together to stop a greater evil that is emerging in the wizarding world. This would involve a lot of tension and distrust between them at first, but gradually they could start to understand each other more.
Their relationship could be developed differently by having them be more open about their relationship from the start. Instead of hiding it, they could face the consequences together, which would change the whole dynamic with the Jedi Council and the Senate.
Another way is to show their relationship as a power struggle. In the dark fanfiction, Sasuke could have new powers that make him a threat, and Sakura, not willing to be overshadowed, tries to gain equal or greater power. Their relationship then becomes about who is stronger and who will ultimately control the situation, all while their underlying feelings for each other still exist in a distorted way.
Well, at first, they might seem closer as they are now both part of the same 'dark' world. But soon, the dark side's influence of greed and power - hunger would start to drive a wedge between them. Anakin, with his already tumultuous relationship with power, might try to dominate Ahsoka. Ahsoka, having been dragged into the dark side against her will perhaps, would resent Anakin for it. Their relationship would be a volatile mix of shared darkness and individual power struggles.