Sansa Stark could also play a role. She and Karsi could form an alliance based on their mutual understanding of the importance of female leadership in a male - dominated world of Westeros. They might work together to gain more power and influence for the North.
A writer who has a deep understanding of the 'Game of Thrones' lore and the character of Karsi would be considered a great writer for her fanfiction. They would be able to incorporate elements from the original series, like the political intrigue and the magic, into a story that focuses on Karsi. This could make for a really immersive and exciting fanfiction.
One interesting plotline could be how Karsi might have changed the power dynamics in the North. Maybe she forms an unexpected alliance with a major house, like the Starks, and together they face a new threat that was not in the original series.
There might be a fanfiction where Karsi has a backstory that is more deeply explored. For example, her life before joining the wildlings, her family, and how those things influenced her actions in the story. It could show her as a more complex character with motives beyond what was shown in the original series.
Jon Snow could be one. He has a sense of honor and leadership, much like Obi - Wan. They could bond over their shared values and Jon could learn from Obi - Wan's wisdom. Another could be Daenerys Targaryen. She is on a quest for power and Obi - Wan might see her as someone who needs guidance to use her power responsibly.
There could be a young, ambitious knight who has seen the injustices in the Seven Kingdoms and becomes a key figure in the uprising. Another might be an old and wise maester who secretly supports the uprising and uses his knowledge to help the rebels. Also, a strong - willed noblewoman who has her own reasons for wanting change could be one of the main characters.
There's no way to know exactly without reading it. However, in a 'Game of Thrones' - themed fanfic with 'no mercy' in the title, it's likely to have some of the fan - favorite characters in key roles. Maybe Arya Stark, with her assassin skills, could be a main character, showing no mercy to those on her kill list. Or it could be Cersei Lannister, being even more merciless in her quest for power and revenge than she was in the original series.
I think Naruto would be like the central hero, similar to how Daenerys was in Game of Thrones. He wants to bring change and justice. Then there's Kakashi, who could be like a wise advisor, much like Tyrion Lannister in some ways. And Gaara, with his past of being an outcast, could be a character who rises above his circumstances, just like Theon Greyjoy did at some points.
There might be a Stark character as well, since in 'Game of Thrones' the Starks are often associated with wolves. They could be intertwined with the Black Wolf's story, perhaps as its protector or someone it protects.
The main characters could also be entirely new characters introduced in the fanfic. The author might create someone who has a unique connection to the events of the original series and is given the task of changing things. However, it's also possible that classic villains like Cersei could be main characters if the fanfic is about giving her a second chance at ruling, perhaps with a different approach this time.
There might be a new character introduced in the fanfic. This character could be a commoner who has a special connection with the dragon. For example, a shepherd who once saved the dragon when it was a hatchling and now the dragon has returned to repay the kindness. This character then gets involved in the high - stakes politics of Westeros because of their relationship with the dragon. Another main character could be a powerful lord or lady who sees the dragon's return as a threat to their power and will do anything to stop it or control it for their own gain.