Another theme is the exploration of different timelines and their implications. Asta may visit timelines where things are drastically different. This allows the author to play with different character developments and world - building. For instance, he could see a world where his friends turned into enemies due to a single different choice in the past, and he has to find a way to set things right.
Sure. One popular asta time travel fanfiction is 'Asta's Time - Traveling Adventure'. In this fic, Asta goes back in time and has to face his past self, which creates some really interesting character dynamics.
Since lemon fanfics are inappropriate, we should focus on their general characteristics from the official story. Asta is highly determined and energetic, always striving hard despite his lack of magic initially. Yuno, on the other hand, is more calm and has a natural talent for magic. They both have a strong bond as rivals and friends.
Noelle could be a great addition. Her water magic is quite powerful and she has a complex relationship with both Asta and Yuno. She could be a source of both support and conflict in the fanfic. Another good character is Luck. His lightning magic and his rather unpredictable nature can add a lot of action and excitement to the story.
Asta would likely bring a new level of determination to the Crimson Lions. His never - give - up attitude could inspire the team members during tough battles.
Asta is still alive in the manga. The story keeps evolving with him at the center of the action. There have been many difficult situations, but he manages to overcome them without dying.