Charles Oliveira was a Brazilian kickboxing and mixed martial arts athlete. On May 16, 2021, he defeated Michael Chan in UFC262 and became the new UFC lightweight champion. On December 14, 2021, at UFC269, he successfully defended his lightweight belt. However, on May 8, 2022, in UFC274, he was unable to win the lightweight title due to his weight. Oliveira had a 28 - 8 - 1 inconclusive record in his career, defeating top players such as Tony Ferguson, Kevin Lee, and Michael Chan. He was seen as the image of a low-class person who had made a comeback. After years of hard work, he finally became the UFC champion.
One common theme could be loyalty. Given the nature of Daryl Dixon's character in the original show, loyalty to friends or comrades like Gene Dixon and within the context of Trinity might be a big part of the fan fictions.
Daryl Dixon isn't gay in the comics. The storylines mainly revolve around his adventures and struggles in a post-apocalyptic world, not his sexual orientation.
It depends on their popularity and the creativity of fans. If people are really into their characters and potential relationship, fanfiction could definitely exist.
I don't think Dixon Hill is a real novel. It could be a name given to a fictional work in a movie, TV show, or game, but not something you'd find on the shelves of a bookstore as a genuine novel.