Well, Mikey might be a bit surprised at first. He would probably be intrigued by the different scenarios the fanfiction presents about Takemichi. Draken, on the other hand, might be more critical and analyze how the fanfiction portrays Takemichi's growth and relationships. Mitsuya could find it interesting from an artistic point of view, seeing how the writer has used Takemichi's character to create new stories.
Tokyo Revengers Season 1 typically ends around a specific chapter in the manga, but it can vary depending on the adaptation decisions. You might want to check reliable manga sources or fan discussions for the exact chapter.
Some characters might become more protective of Takemichi if the fanfiction shows him in a difficult situation. They would feel a stronger bond towards him, wanting to ensure his safety. However, if the fanfiction distorts Takemichi's character too much, it could cause some confusion and even a bit of a rift. They might start to question if they really know Takemichi as well as they thought.
I don't have the exact chapter number off the top of my head. Sometimes it's not straightforward to match the anime season to specific manga chapters. It's best to search online or consult with fellow fans who are up-to-date on the series.