One popular 'ace attorney reaction fanfiction' story could be the ones where the characters react to alternate universe scenarios. For example, seeing how Phoenix Wright would react if he was in a world without the court system as he knows it.
Well, reactions to RWBY Death Battle fanfiction can vary greatly. Some might be excited about the unique battles and character match - ups depicted in the fanfiction. It could bring out new perspectives on the RWBY characters' abilities and how they would fare against each other in different scenarios. For example, seeing how Ruby's speed and scythe skills compare to another character's powers can be really thrilling.
First, know the characters well. For example, understand Phoenix Wright's unwavering belief in justice and how he would act in various situations. Then, come up with unique scenarios for them to react to. It could be something as simple as a new law being introduced in their world.
One interesting 'death battle reaction fanfiction' story could be where characters from different universes react to a fight they never expected. For example, superheroes from Marvel reacting to a battle between anime characters. They might be shocked at the unique powers and fighting styles.
Fanfiction writers often play with the idea of unfulfilled dreams or destinies. Ace and Sabo had so much more they could have done. So, in some fanfics, their memories are so strong that they exist as a sort of spiritual force. And this force is then able to influence events in a way that leads to their physical resurrection. For example, their memories might guide Luffy to a place where he can find the means to bring them back.
First, know your characters well. If you're having characters from different franchises react, you need to understand their personalities, values, and how they would typically respond to a violent or intense situation. For example, a pacifist character would react very differently from a battle - hungry one.
I recommend One Piece: The Great God Usopp to you. This book is a story about Usopp. It tells the story of how he obtained the League of Legends system through an accidental transmigration and became invincible. If you want to read a One Piece Doujinshi novel with a deceptive cloth as the main character, this book is perfect for you. I hope you will like my recommendation.