Some fanfictions might explore a situation where Anakin is being manipulated by a powerful dark force or a Sith Lord. This dark influence makes him see Obi - Wan as a threat to a grander plan. So, he kills Obi - Wan as part of this dark scheme, not fully in control of his own actions. And this can lead to a lot of complex emotions and plot developments later in the story, like Anakin's further descent into darkness and how the other characters react to Obi - Wan's death.
It depends. Some might think he is better in the novel as it offers more depth to his character. Others might have a different opinion based on personal preferences.
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.
I'm not entirely sure, but it's very likely. There are so many creative fans out there who enjoy combining different fictional worlds. It could be a really interesting read, imagining Naruto in the role of General Grievous. You might have to do some digging on various fan - created content platforms though.
General Grievous was a feared and powerful cyborg general in the Star Wars universe. He was the leader of the droid army of the Separatists. He was known for his four lightsaber combat skills, which made him a formidable opponent. He had a very menacing appearance with his skeletal body and multiple limbs. His backstory involved being enhanced with cybernetic parts, which increased his strength and combat abilities. He was a key figure in the Clone Wars, causing much trouble for the Jedi.
I don't think there is a specific canon comic dedicated solely to explaining General Grievous. But you might find some background info in related comic series.
Dooku could be considered interesting. He has a complex relationship with Grievous and his own motives in the whole Star Wars scheme. Another one might be some of the Jedi that Grievous encounters. Their different fighting styles and philosophies make them interesting.
The impact would be far - reaching. For the Jedi, Obi - Wan's death at Anakin's hands would be a major blow to their morale. His teachings and wisdom were highly valued. Without him, the younger Jedi might lose their way. In the greater Star Wars universe, it could change the course of the war. Anakin's actions could lead to different alliances being formed. Some planets might side with the Sith out of fear or a belief that they are the new power. It would also affect the relationship between the Force - sensitive characters. Those who were close to Obi - Wan might seek revenge, while others might try to redeem Anakin.
Padmé would be devastated. She loved both Anakin and Obi - Wan. Her relationship with Anakin would become extremely strained, if not completely broken. She might try to stop Anakin from further falling into the dark side or, in her grief, turn against him.
There are indeed. A lot of fanfic writers like to take established characters and re - imagine them. In the case of a female General Grievous, it could be really cool. For example, one fanfiction might have her with a different personality trait, like being more diplomatic in addition to her combat skills. Another might focus on her origin story and how she became the feared warrior in a female form. You just need to dig around a bit on the right websites.