Rias would be devastated. Issei was not only her servant but also someone she had deep feelings for. She would likely go into a rage at first, vowing to find and punish whoever was responsible. Akeno would be heartbroken as well. She and Issei had a special bond, and she would be in mourning for a long time. Kiba might feel a sense of guilt, wondering if he could have done more to protect Issei. Asia would be in shock and constantly pray for Issei's soul, hoping for some kind of miracle.
Yes, there might be. There are a vast number of fanfictions out there for various combinations of popular culture elements. Since Highschool DxD has a large fan base and Godzilla is an iconic figure, it's not unlikely that some creative fans have combined the two in a fanfiction. You can try searching on popular fanfiction websites to find such works.
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.
Rias would be initially cautious. Since she was so used to Issei, the new OC would be an unknown factor. She would likely test the OC's loyalty and abilities. Akeno might be intrigued by the change, seeing it as an opportunity to get to know someone new. Koneko, on the other hand, would be more reserved and take her time to warm up to the OC.
Yes, there are likely fanfictions out there with such a concept. In the 'Highschool DxD' universe, there are so many creative interpretations by fans. Some fanfiction writers might explore the idea of Issei taking on a Satan - like role for various reasons, perhaps to add a new twist to the story, explore different power dynamics, or to create unique character relationships.
One great Issei and Koneko fanfiction is 'The Bond of Opposites'. It delves into their relationship in a really interesting way. It shows how Issei's brash nature and Koneko's quiet demeanor play off each other.
In a fanfiction, it could be that Koneko and Issei are chosen for a special mission by the Gremory group. They are initially hesitant to work together as they have different approaches. However, as the mission progresses, they start to complement each other's styles. Koneko's stealth and Issei's more upfront fighting style work in harmony to defeat the enemy and complete the mission, and in the process, their relationship grows.
One great Issei and Ophis fanfiction could be where they team up to face a new powerful enemy. In this type of story, their unique abilities combine in interesting ways. For example, Issei's boosted gear and Ophis's dragon powers could create some really cool fight scenes. It might also explore their relationship further, perhaps showing how they grow to trust each other more on a deeper level.
One great fanfiction idea could be that Issei discovers a new power within himself that is directly linked to Rias's heritage. Maybe he can tap into an ancient magic that only works in harmony with Rias's own powers. As they train together to master this new ability, their relationship deepens beyond just the typical master - servant bond in the Highschool DxD world.
One great fanfiction idea could be Issei and Irina going on a special adventure together in the world of Highschool DxD. Maybe they discover a hidden power or a new realm. They could face challenges that test their relationship and grow stronger as a result.