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.
Percy may also try to find loopholes. Given his cleverness and his experience in dealing with the complex world of gods and prophecies, he would look for ways to work around the control of fate. He could use his relationships with other characters, like Annabeth's wisdom or Grover's loyalty, to help him figure out how to gain more control over his own destiny in the fanfiction.
Fate characters with a more empathetic side, like Jeanne d'Arc, might try to understand what drove Jack the Ripper to become a killer. She might hope to redeem him rather than simply defeat him. Meanwhile, the more battle - hungry characters like Lancelot would be eager to test their skills against Jack. Lancelot would be drawn to the danger that Jack represents and see it as a chance to prove his worth in combat. The different reactions would create a rich tapestry of interactions within the fanfiction.
Well, in such fanfiction, characters from Fate might show shock at the unexpected matchups in Death Battle. For example, they could be surprised by the power levels of characters they've never encountered before.
One idea could be to have characters from Naruto end up in the world of Danmachi. For example, Naruto himself could find his way into the dungeon and his ninja skills would be put to the test against the dungeon monsters. His shadow clone jutsu could be used in interesting ways, like sending clones into different dungeon levels to scout or fight. Another idea is to have the concept of chakra introduced into the Danmachi world. This could change the way adventurers fight and level up. Maybe some of the Naruto characters could train the Danmachi adventurers in new combat techniques.
One aspect that can be explored in Freya and Bell fanfiction is the idea of destiny. Freya believes Bell is destined for great things, and she wants to be a part of that journey. A fanfiction could show how she subtly influences Bell's choices in the dungeon, leading to both growth and conflict. Bell might start to question why certain opportunities seem to present themselves so conveniently, and as he discovers Freya's role, he has to decide whether to accept her help or forge his own path.