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.
It could have completely changed the course of the Star Wars universe. With Palpatine out of the picture, the Sith might have crumbled and the Jedi could have regained their influence.
In some fanfics, it could be Anakin's own self - destructive tendencies. He has made so many bad choices in his life that in the end, his own actions lead to his death. For example, if he continues to pursue the dark side without fully understanding its consequences, it could ultimately consume him and lead to his demise.
One possible plot could be that Anakin somehow manages to escape the destruction of the Death Star at the last moment. Maybe he uses his strong connection to the Force to find a hidden escape pod or a secret passage. He then has to evade the Empire's search for him while also trying to figure out how to use this second chance to redeem himself further.
Had Anakin killed Palpatine, it's likely that there would have been chaos initially. Different factions might have vied for control. But in the long run, it could have paved the way for a new era of hope and stability in the Star Wars galaxy.
It could be a new and powerful dark side user. This character might have emerged from the shadows, having trained in secret, and their sole purpose is to take down Anakin as he is seen as a threat to their plans for galactic domination.
He would likely become more cautious. After surviving such a near - death experience on the Death Star, he would realize the true power of the Empire and be more careful in his actions against them. His redemption arc could continue as he tries to use his skills for the good of the galaxy, maybe by training new Jedi or helping the Rebellion in secret.
Well, Anakin started out as a very special kid on Tatooine. He was super good at fixing things and flying ships. The Jedi sensed his strong connection to the Force and took him in. Anakin grew up in the Jedi Order. He fought in the Clone Wars and became a great hero. But he was always haunted by his past and his emotions. His relationship with Padmé was a big factor. When he thought he could save her from dying by using the dark side powers, he made the wrong choice. This led to his transformation into Darth Vader, which changed the course of the Star Wars galaxy for a long time.