Yes, there might be. The Naruto and Blue Exorcist fandoms are both quite large, and it's not uncommon for fans to create crossover fanfictions. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own.
Yes, the Blue Exorcist manga is over. It took readers on an exciting journey and concluded in a way that left a lasting impression. The final chapters brought closure to the characters and their adventures.
Yes, the Blue Exorcist had a novel."Sakura Manichi's Infinite Manga" was a manga novel based on the Blue Exorcist. As for the other plots, you can take a look at the book title and genre to understand more.😋I recommend the following two novels to you: The Exorcist Princess is a classical Xianxia novel, which tells the story of an exorcist traveling to ancient times; The City's Exorcist Apprentice is an urban supernatural novel. The protagonist is an ignorant exorcist apprentice who starts a battle with demons and monsters and discovers the truth of hundreds of years. I hope you like this fairy's recommendation. Muah ~😗