There's also 'Cross - Realm Defenders'. In this fanfiction, the demon - slaying aspects of both series are the focus. Characters from both shows form a sort of alliance. It shows how Kuwabara from Yuy Yu Hakusho might react to the more formal exorcist system in Blue Exorcist, and how the Blue Exorcist characters would view Kuwabara's unorthodox fighting style. It's full of action and some really cool battle scenes.
A really creative plot is in a fanfic where the afterlife concepts from Yuy Yu Hakusho are merged with the demon hierarchy in Blue Exorcist. The story has Yusuke being sent on a mission by Koenma to help the Blue Exorcist crew deal with a demon that is trying to disrupt the balance between the human world and the demon world in a completely new way. It plays with the idea of different levels of existence and power in both universes.
Well, a really common one is a training - based crossover. Imagine Yusuke training Rin in some of his more unorthodox fighting techniques from Yu Yu Hakusho. Or perhaps the opposite, with Rin teaching Yusuke about demon - slaying weapons. Another popular concept is a friendship - centered crossover. Since both shows have themes of friendship and loyalty, fans might write about the characters becoming fast friends. They could go on adventures together, sharing their different perspectives on the spirit and demon worlds. And of course, there's always the idea of a love - interest crossover, where a character from one show has an unexpected romantic encounter with a character from the other, though this is less common in these types of action - based shows.
First, you need to study both series well. Know the characters' personalities, powers, and backstories. For example, in Blue Exorcist, Rin is a half - demon with a complex relationship with his demon side, and in Yu Yu Hakusho, Yusuke is a delinquent - turned - spirit detective. Then, come up with an interesting plot that combines elements from both worlds. It could be a mystery that requires the skills of both sets of characters. Also, make sure to write good dialogue that reflects the different speaking styles of the characters from each series. If you do these things, you'll be on your way to writing a great fanfic.
One great 'Blue Exorcist Amaimon Tail' fanfiction is 'The Hidden Power of Amaimon's Tail'. It delves into the mystery of how Amaimon's tail could potentially hold a power that no one has yet discovered in the anime or manga. It's really interesting as it shows Amaimon in a different light, more vulnerable yet still powerful.
One great 'yu yu hakusho crossover fanfiction' is the one where Yu Yu Hakusho characters cross over with Naruto characters. It's really interesting to see how the different power systems interact. For example, Yusuke's spirit gun against Naruto's Rasengan.
One great Blue Exorcist and Highschool DxD fanfiction is 'The Crossover Quest'. It combines the unique elements of both worlds in an exciting adventure. The characters from both series interact in really interesting ways, like Rin Okumura and Issei Hyoudou teaming up to fight a common enemy that has characteristics from both the demon worlds in their respective shows.
Well, in Highschool DxD fanfiction, 'Devilish Alliances' is a popular one. It delves deep into the political aspects of the devil world. As for Blue Exorcist, 'Rin's Hidden Powers' fanfiction explores Rin's powers more in - depth than the original story. And for Highschool DxD, there's also 'The Unusual Sacred Gear' which has a really unique take on the concept of Sacred Gears.
One popular Blue Exorcist harem fanfic is 'The Demon's Heart'. It has an interesting plot where the main character finds himself in the middle of multiple characters' affections. The character development is well - done, and it keeps the essence of the Blue Exorcist world intact.
One popular 'Yu Yu Hakusho Yusuke Crossover Fanfiction' is the one where he crosses over with the Naruto universe. In this fanfic, Yusuke's tough - guy attitude clashes with Naruto's optimistic nature at first, but they end up learning from each other. Another interesting one has Yusuke in the Bleach world, facing off against Hollows and Soul Reapers. It's really exciting to see how his spirit energy works in a different supernatural setting.
One great yu yu hakusho hiei crossover fanfiction is 'Hiei's New Realm' where Hiei is transported to a different dimension full of new challenges and allies. It has really interesting character interactions.