Conflict between different moralities also frequently appears. The new world he crosses into may have different values and ethics compared to his own. His 'evil' side might be more in tune with some aspects of the new world while his original heroic side clashes with others, creating a complex web of moral dilemmas.
One popular 'evil asta crossover fanfiction' could be one where he crosses over with a character from another shonen series like Naruto. In such a fic, Asta's dark side might interact with Naruto's determination in interesting ways, perhaps leading to a battle of ideologies between the two worlds.
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.