It's kind of a mixed bag. Some aspects of Thor's character and story in Ragnarok are true to the comics, but there are also significant changes and creative liberties taken.
The movie Thor: Ragnarok draws its roots from the Marvel Thor comics. It weaves together elements from different comic issues to bring the story to the big screen. The comic influence is evident in the characters, settings, and overall plot of the movie.
You can start by looking at popular fanfiction websites like Archive of Our Own. They have a wide range of fanfictions, and you can search specifically for Thor Ragnarok ones. You can also check out fan communities on social media platforms like Reddit. There are often threads where people recommend good fanfictions. Another option is to follow blogs dedicated to Thor Ragnarok or Marvel in general, as they sometimes share great fanfiction finds.
Well, first of all, you should keep in mind that fanfiction can vary greatly in quality. Some might be really well - written with engaging storylines, while others might be a bit rough. When watching Thor Ragnarok fanfiction, you might come across different pairings of characters that are not in the original movie. This can be interesting as it gives a new perspective on relationships. And don't be surprised if the tone of the fanfiction is different, like it could be darker or more comical than the actual movie.
Hulk is another character that could be popular. His brute strength and his unique relationship with Thor in Ragnarok are great fodder for fanfiction. Writers might explore his time on Sakaar in more detail, or his interactions with the Asgardians when he finally arrives in Asgard.
One interesting plot idea could be the exploration of Asgardian characters' reactions to Thor's journey in Ragnarok from a different perspective. For example, how the common Asgardians felt about Thor's battles and his newfound friends. Maybe some of them were skeptical at first but then became inspired by his growth.
In the 'last man on earth Karl story', Karl is the central figure. He could be an ordinary person who was thrust into this extraordinary situation of being the last human. Maybe he has certain skills or qualities that help him survive, or perhaps he has to learn quickly how to endure in this new, lonely world.