One idea is that Obi - Wan could be influenced by a powerful dark side entity. This entity could be a long - forgotten Sith spirit. It slowly corrupts his mind, making him question the Jedi teachings. He starts to see the Jedi's pacifism as a weakness. Another plot could be that Obi - Wan is framed for a heinous crime within the Jedi Order. Feeling betrayed by his own kind, he turns to the dark side to seek revenge.
A really interesting plot could be that Obi - Wan Kenobi has a vision of a future where the Jedi Order fails miserably. In his desperation to prevent this future, he turns to the dark side, believing that its methods are more effective. He tries to build his own army of Dark Jedi, recruiting disillusioned Jedi and Force - sensitives from across the galaxy. However, as he delves deeper into the dark side, he realizes that he may be becoming the very thing he was trying to prevent.
In a Dark Jedi Obi - Wan Kenobi fanfiction, his relationship with Anakin could be drastically different. Instead of being a mentor, he could be a rival. They might compete for power within the Sith hierarchy. Obi - Wan's appearance would also change. His robes could become darker, and there could be a more menacing look in his eyes. His connection to the Force would take on a darker hue, using it more for personal gain and domination.
In some 'dark Obi - Wan Kenobi fanfiction', he could be corrupted by a Sith Lord who manipulates his past traumas. The Sith might use his memories of the Clone Wars and his losses to push him towards the dark side. Obi - Wan would then have to fight not only the external influence but also his own demons as he descends into a darker version of himself.
One idea could be that the OC is a young Jedi in training and Obi - Wan becomes their mentor. They go on a mission together to a planet on the Outer Rim where they encounter a new Sith threat. The OC has a unique Force ability that Obi - Wan helps them to develop further, and in the process, they form a deep bond of friendship that could potentially turn into something more.
Another plot could involve Obi - Wan traveling to the future. He might see a world where the Jedi have been completely wiped out and he has to find a way to bring them back. He could discover new Force abilities or meet descendants of the Jedi who have been hiding their powers all this time. This would be a great way to explore a different kind of Star Wars universe.
Sure. There are quite a few. A lot of 'obi wan kenobi dark side fanfiction' plays with the idea of alternate universes. In these stories, factors such as his relationship with Anakin could take a different turn and lead him astray. Maybe he becomes disillusioned with the Jedi way and is lured by the power of the dark side. It's a really interesting concept to explore in fanfiction.
His death is portrayed as a heroic and selfless act. He gives his life for the greater good, which is very much in line with the Jedi code.
One interesting concept could be a crossover with the Star Trek universe. Imagine Obi - Wan using the Force in a world where technology and different species co - exist in a more scientific - based way. Another concept might be a crossover with the Lord of the Rings. Obi - Wan could bring his Jedi skills to Middle - earth and interact with the wizards and warriors there. Also, a crossover with the Harry Potter universe could be cool, with Obi - Wan teaching the young wizards about the Force which could be seen as a different form of magic.
One common theme is the struggle between light and dark within Obi - Wan. It shows how he might battle his own inner demons. Another is the impact on his relationships, like with Anakin or the Jedi Order.
One plotline could be that Obi - Wan is tricked into believing that the only way to save the galaxy is by embracing the dark side. He starts to hunt down Jedi who oppose his new vision, thinking he is doing the right thing. For example, he might target young Padawans, believing they are too naive to understand the true state of the galaxy.
There might be a fanfiction where Obi - Wan's reaction to the destruction of the Jedi Order is explored in great detail. It could involve his efforts to save as many Jedi as possible and his feelings of guilt and determination at the same time. He might have to make some really tough decisions, and the fanfiction could show how he copes with all that.