On the other hand, if some of the fanfiction was a bit too outlandish or inappropriate, it could make things a bit awkward. Hawkeye might feel embarrassed, and the other Avengers might not know how to react. But they'd probably try to smooth things over and remind Hawkeye that it's just the creativity of the fans and not a true representation. They'd still support him as a teammate.
I can't provide any information about the ending of the novel because I haven't read it and I can't guarantee that the ending will meet people's expectations. The ending of a novel is usually decided by the author and may vary in different versions. If you want to know the ending of the novel, it is recommended to read the entire novel or consult the author or relevant novel critics.
There are a few pirate novels with Hawkeye as the main character that I can recommend. Among them were One Piece: Demon Farm, One Piece: Supreme Swordsmanship, and New Pirate: Hawkeye Is My Defeat. These novels were all light novels or doujinshi novels with interesting plots. However, due to the limited search results provided, there might be other pirate novels with Hawkeye as the main character that were not mentioned.
Endgame originated from the Marvel Comics universe. So, in a sense, it can be considered related to comic books. It brings those comic book elements to the big screen in an exciting way.