The characters from Danmachi could have a range of reactions to Fate fanfiction. Some might be confused at first, especially if the fanfiction has very complex Fate lore. However, those who are more open - minded, like Bell, might be excited to explore new stories and ideas. He could see similarities in the way heroes are portrayed in both worlds and be inspired by it.
One way a Danmachi - Fate fanfiction crossover could function is through the concept of parallel universes. The two universes could be connected in some way, and certain events could cause portals to open between them. In this scenario, the adventurers from Danmachi would enter the Fate world. They would be faced with the complex politics and power struggles there. The Fate characters might view the Danmachi characters as strange new entities. There could be a lot of misunderstandings at first, but as they get to know each other, they could learn from each other's strengths. For example, the Danmachi characters could learn about the strategic use of Command Spells from the Fate characters, while the Fate characters could be impressed by the physical combat skills of the Danmachi adventurers.
One of the great Danmachi fanfics is 'A Different Perspective'. It offers a fresh take on the characters and their relationships within the Danmachi universe. The story delves deeper into the backstories of some minor characters and makes them more significant. Another good one is 'The Unseen Adventures'. It takes the characters on new quests that are not in the original story, adding more excitement and mystery.
The Danmachi light novel is finished. The author completed the series, providing a satisfying conclusion to the adventures and developments of the characters.