There is a fanfic called 'Issei's Human Ascent'. In this story, Issei decides to fully embrace his humanity and rejects the more violent and power - hungry aspects of the supernatural world. It has some really interesting character development as he struggles to maintain his newfound human - only identity. There are also some great fight scenes where he uses his wits instead of brute strength.
Many fans like the idea of Issei staying human in fanfiction because it can lead to some really creative plotlines. Writers can create new challenges for Issei that are unique to his human state. He might not have access to all the powerful abilities he would have as a non - human, so he has to be more creative in how he solves problems. This makes for some very engaging and unpredictable stories. Additionally, it can attract a wider range of readers who might be more interested in human - centered stories rather than just the typical supernatural power - up stories.
There's a fanfiction called 'Issei's Encounter with Merlin'. In this one, Issei meets Merlin in a magical forest. The author does a great job of portraying Merlin's mysterious nature and Issei's reaction to it. It also has some unique magical elements that make it stand out.
I really like the fanfiction 'Iron Man's Apprentice: Issei'. In this one, Issei is sort of taken under Iron Man's wing. It shows how Issei adapts to the new technology and also how his character develops with the influence of Tony Stark. There are some amazing fight scenes where Issei uses his new - found skills and tech to fight against the villains from both universes.
There's a fanfiction titled 'Female Ddraig's Encounter with Issei'. In this, the author delves deep into how a female Ddraig would view Issei. It's full of character development and new scenarios that are quite different from the canon. For example, their conversations are more nuanced as the gender change of Ddraig affects her perspective on Issei.
One interesting Issei Crossover Fate fanfiction could be 'Issei in the Fate World'. In this story, Issei is transported to the Fate universe and has to adapt to its rules and magic system. He might form new alliances and face off against powerful Servants. Another good one could be where he teams up with Shirou to fight a common enemy that threatens both their worlds.
One great Highschool DxD Gamer Issei fanfiction is 'Issei's New Game'. It takes Issei's character and adds an interesting gaming twist to his adventures in the Highschool DxD universe. The story is full of action and the character development is really well - done.
One interesting Issei crossover fanfiction could be where he crosses over into the world of 'Fate/stay night'. In this scenario, Issei's devil powers might interact in unique ways with the Servants and magic in the 'Fate' universe. Another could be a crossover with 'Naruto', where Issei has to face the shinobi world with his devil abilities. There are also some crossovers where he goes to the world of 'One Piece' and has to deal with pirates and Devil Fruits while still having his own devilish powers.
One interesting fanfiction could be 'The Silent Ascent of Issei'. In this story, Issei's muteness adds a whole new layer to his character development. Instead of his usual brash self, he has to communicate in more creative ways, which makes his relationships with the other characters, like Rias, more nuanced and deep. It's a great read for those who want to see a different side of Issei.
One popular one might be 'Naruto's New Path in the World of High School DxD' where Naruto reincarnates as Issei. It's interesting as it combines Naruto's ninja skills with Issei's world of devils and angels. The story often has Naruto using his chakra control and combat experience to navigate the complex relationships and battles in Issei's world.
One popular 'activist Issei Hyoudou fanfic' is 'Issei's New Path'. It shows Issei taking on more of an activist role in the supernatural world, fighting for the rights of the weak. Another one could be 'Hyoudou's Activist Agenda' which focuses on his efforts to reform the devil society from within.