Well, it could be part of a complex plot where Anakin is deceived into believing that Obi - Wan's child is a Sith in disguise. The Sith could manipulate events and plant false evidence, causing Anakin, who is already on the edge due to his inner turmoil, to lash out and kill the child. This would then lead to a huge rift between Anakin and Obi - Wan, and Obi - Wan would likely be consumed by grief and a thirst for revenge.
Perhaps in a dark and alternate universe fanfiction, Anakin has fully embraced the dark side much earlier. He views Obi - Wan as his enemy and decides to strike at him in the most cruel way possible - by killing his child. This act could be a show of power and a way to break Obi - Wan's spirit. It would also have far - reaching consequences for the Star Wars universe in that fanfiction, causing chaos and a shift in the balance of power as other Jedi and Sith react to this heinous act.
In fanfiction, one possible way could be out of jealousy or being corrupted by the dark side. If Anakin felt that Obi - Wan's child was a threat to his power or position in the Jedi Order, he might be driven to kill. But this goes against his character in the original canon to a large extent.
Maybe Anakin is fully consumed by the dark side. The dark side often twists a person's mind, and he might see Obi - Wan's child as a threat to his own power or position. So, in his warped state of mind, he decides to eliminate the child.
It might also cause a huge shift in the balance of the Force. Anakin's act could be seen as a major step towards the dark side, and it could start to tip the scales in favor of the Sith. The galaxy would then be plunged into even more chaos as the Sith gain more power and the Jedi are left reeling from the shock of such a heinous act.
The most obvious implication is the destruction of Obi - Wan's world. Obi - Wan would be devastated and likely turn all his efforts towards revenge. This would change his character from a calm and collected Jedi to a more vengeful figure.
Well, in this fanfiction plot, their shared origin as twins could lead to a different approach to the Force. Maybe they develop a new form of lightsaber combat that is based on their twin - like coordination. As the story progresses, Anakin's relationship with Padmé could also be affected. Since Obi - Wan is his twin, he might be more involved in Anakin's personal life. And when Anakin starts to feel the conflict between the Jedi Code and his love for Padmé, Obi - Wan, as his twin, tries to help him find a balance. This could potentially prevent Anakin from falling to the dark side, or at least make his fall a much more complex and drawn - out process.
If Anakin killed Obi Wan, it could have a domino effect. Anakin's relationship with other characters would likely change. Maybe the Jedi Order would crumble faster, and the Sith would gain more dominance. It's a fascinating 'what if' scenario to explore in fanfiction.
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.
One possible consequence is that the Jedi Order becomes stronger. With Anakin remaining on the light side, his power is added to the Jedi's arsenal. They can better face the threats from the Sith and other dark forces.
Well, in a fanfic where Anakin beats Obi - wan, it might be due to Anakin's raw power potential finally being fully unleashed. Anakin had incredible Force abilities that were often held back by his internal conflicts. In this fanfic scenario, perhaps he overcame those conflicts in a different way, allowing him to focus all his power on the fight against Obi - wan. Also, external factors like the environment could play a role. If the battleground was more favorable to Anakin's fighting style, it could give him the upper hand.
One common theme is loyalty. Their relationship was based on loyalty in the Jedi Order, but that loyalty gets tested as Anakin starts to turn to the dark side. Another theme is mentorship. Obi - Wan was Anakin's mentor, and fanfictions often explore how that mentorship influenced Anakin's growth and downfall.
Sure, in the world of Star Wars fanfiction, the possibilities are endless. Since the Star Wars universe has such a large and dedicated fan base, there are bound to be some stories where Obi - Wan is Anakin's twin. Writers might explore how their Force - sensitivities interact differently as twins. Maybe they would have a special way of communicating through the Force that is unique to their twin relationship. Also, it could add a whole new layer of drama to the story, especially when Anakin starts to turn to the dark side. How would Obi - Wan, as his twin, react?