What could happen in a Highschool DxD Issei birthday fanfiction?

One idea for a fanfiction about Issei's birthday could be that the Occult Research Club throws him a surprise party. They decorate the clubroom with all his favorite things, like pictures of his favorite heroes and a big banner that says 'Happy Birthday Issei'. Rias could present him with a special gift, perhaps a new piece of sacred gear that has been customized just for him.

One idea could be that Issei is a huge Godzilla fan and he finds an ancient relic related to Godzilla. This relic starts to influence his abilities and his relationships in the Highschool DxD universe. For example, it could make him more aggressive in fights but also attract the attention of some powerful and mysterious beings who also have an interest in the relic.

A simple plot could be that they compete in a school - wide tournament. Koneko's pride as a Nekoshou and Issei's determination to prove himself make for an interesting dynamic. They both face tough opponents and along the way, they offer each other advice and support, gradually becoming closer friends.

It could involve exploring Issei's character development earlier than in the original. Maybe showing his growth in power or relationships in a more rushed way. For example, he might gain his powers more quickly and start interacting with the devils and other supernatural beings in a premature manner, leading to different story arcs and interactions compared to the official plot.

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.

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.

Well, it could be about Issei using his singing as a new power or ability. Maybe his singing can charm the devils, angels, and fallen angels alike. He could perform in some sort of supernatural concert where his voice has magical effects on the audience, like making them more friendly towards each other despite their different factions.

In fanfiction, Ophis and Issei could have a mentor - mentee relationship. Ophis is extremely powerful, and she might take Issei under her wing to help him grow stronger. This could involve her teaching him about his powers and how to better control his devil abilities.

A Rias and Issei wedding fanfiction could be full of grandeur. There would be various characters from the Highschool DxD universe in attendance. The wedding might take place in a magnificent location, perhaps a grand cathedral-like place in the Underworld. Rias would look stunning in a traditional yet unique wedding dress, and Issei would be in a sharp suit. Their friends would give heartwarming speeches, and there would be a sense of celebration not just for the couple but for the unity of different factions in the story.

Perhaps the plot revolves around a conflict between the ideals of the Naruto world and Issei's actions in Highschool DxD. The Naruto characters, with their strong sense of justice and camaraderie, see Issei as a threat to the harmony of the new world they find themselves in. So they begin a sort of campaign against Issei. This could involve things like trying to expose his wrongdoings to the other characters in the Highschool DxD world, and at the same time, using their own powers and skills to undermine Issei's position in the school and in the supernatural hierarchy.