Asta and Yuno are childhood friends in a magical world. They both strive to become powerful wizards and fulfill their dreams. Their paths are filled with challenges and adventures.
Power - up themes are also quite common. Fans like to write about how Asta and Yuno gain new powers or improve their existing ones. And of course, there are fanfics that focus on their backstories, filling in the gaps that the original anime or manga might have left.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are often a lot of fanfics about various characters there. Another option is FanFiction.net. Just use the search bar and type in 'Asta and Yuno' to see what comes up.
I'm not sure if 'yuno visual novel' is popular. There are so many visual novels out there, and without more information about this specific one, it's hard to say. It might be popular within a niche group of visual novel fans who are interested in the particular themes or style it offers.
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.
They develop Yuno's character through her actions. Yuno's yandere nature can be shown through her jealousy. If Yuki so much as talks to another character, Yuno might have a strong reaction. Writers also use her internal monologues to let the readers understand her twisted thought process and how her love for Yuki is all - consuming. She might think things like 'Yuki is mine and no one else can have him' which shows her possessive side.
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.