At first, he's likely to be shocked. Issei is often portrayed as a character who trusts easily, so betrayal would come as a big surprise. He might not believe it at first and try to find reasons to justify the actions of the person who betrayed him.
Often, a power - hungry character might betray Issei. In the world of the fanfiction, power is crucial. So, someone who wants more power than Issei may see him as an obstacle. They could betray him by stealing his power - up opportunities or even directly stealing his power if there's some sort of magic or ability transfer in the story. Also, a character with a hidden agenda related to the overarching plot of the fanfiction world, like a secret organization trying to control the balance of power between devils, angels and fallen angels, could use Issei and then betray him when he has served their purpose.
I'm not entirely sure as the description is rather unclear. It could potentially be about a character named Issei in the 'DxD' universe and some sort of action related to a fanfiction about him. Maybe it's about exploring or creating a fan - made story where Issei is involved in a stroking action, though without more context it's hard to be specific.
Issei could develop by learning the discipline and self - control that comes with being an exorcist. This would contrast with his more impulsive devil - side nature. For example, he might have to resist the urge to use brute force and instead use the more strategic and spiritual techniques of an exorcist.
One big part of the appeal is the potential for epic battles. An Evil Dragon Issei would be extremely powerful, so there could be intense fight scenes against other powerful foes. Also, it gives writers a chance to delve into the more complex aspects of his personality. Maybe he has to struggle with new emotions and desires that come with the Evil Dragon form. And it can add a layer of mystery as readers try to figure out how he got to this point and if he can ever go back.
Issei is a popular character in some anime and fanfiction. Evil Dragon in this context might refer to a certain arc or transformation. Fanfiction about Issei as an Evil Dragon could explore different aspects. It could show a darker side of his character, perhaps his struggle with new powers that come with the Evil Dragon form. Or it could be about how his relationships change when he takes on this new and more menacing identity.
There could be. Fanfiction writers are known for their wild and creative crossovers. Given the popularity of Highschool DxD and the unique concept of Guyver, it's entirely possible that an Issei - Guyver fanfiction exists. You might want to check popular fanfiction websites like Archive of Our Own or FanFiction.net. Just search for relevant keywords like 'Highschool DxD Issei Guyver' and see if any relevant stories pop up.
In fanfiction, Issei is often portrayed as a determined and sometimes pervy character. He has his own goals and growth throughout the stories. Sona, on the other hand, is usually depicted as intelligent and in control. She has her own set of responsibilities and her relationship with Issei can range from friendly to something more complex depending on the plot.
Issei develops by facing various challenges. Each encounter in the harem and with the milf - hunting situations makes him grow. He becomes more confident over time.
Issei could become more mature. He might be less impulsive and more strategic in his actions. For example, in battles, instead of just charging in, he would plan his attacks better.