Goku x Highschool DxD Fanfic: What are some interesting plot ideas?

One idea could be a story where Rias and Riser are forced to team up against a common enemy that threatens both of their peerages. This would put them in a situation where they have to set aside their differences and learn to work together. As they do so, they gradually start to understand each other better and a newfound respect develops between them.

One idea could be Son Goku being transferred to the Highschool DxD world as an exchange student. He could be confused by the different rules and the presence of devils, angels and fallen angels. But his combat skills would surely make him a force to be reckoned with in the Rating Games.

Perhaps a plot where a pregnancy occurs as a result of some sort of magical or supernatural accident in the Highschool DxD world. The story could then focus on the search for a way to reverse it or deal with it. Along the way, the characters might discover new powers or secrets about their world. And the relationships between the characters could be tested as they face this difficult situation together.

One idea could be a gamer who gets transported into the Highschool DxD world and uses his gaming skills to gain power and allies. For example, his knowledge of strategy games helps him in battles and political maneuvering within the devil, angel and fallen angel factions.

Another plot idea could be that the gamer character starts a 'game guild' within the Highschool DxD world. He recruits other characters from the series who have an interest in this new way of approaching the challenges in their world. Together, they embark on quests and missions, facing both in - school rivalries and otherworldly threats while using game - inspired teamwork and strategies.

One possible plot could be that Goku is somehow transported to the DxD universe. He might initially be confused by the different rules and magic there. Then, he could start training with the devils and angels, sharing his own fighting techniques. This could lead to some epic battles where he combines his Saiyan powers with the unique abilities in the DxD world.

Goku's powers are on a completely different level compared to most characters in Highschool DxD. His Saiyan abilities like Super Saiyan transformations give him incredible strength, speed, and energy projection. In contrast, the characters in Highschool DxD mainly rely on magic and their devil or angelic powers which, while powerful, are not on the same scale as Goku's in terms of raw power. For example, Goku could easily defeat most low - level devils with a single punch in his base form.

One idea could be that Ichigo is somehow transported to the High School DxD world and has to deal with the Devils and Angels there. He might use his Soul Reaper powers in unique ways to solve the problems in this new world.

Perhaps there could be a crossover of the two schools. The students from Beacon Academy and Kuoh Academy could have an exchange program. Yang might get into some friendly (or not so friendly) competitions with the devils in terms of strength, while Weiss could be fascinated by the more formal and complex social structure in the Highschool DxD world.

Maybe in the fanfiction, there's a magical event that links the world of Illya with the Highschool DxD universe. Illya's innocent nature could be a contrast to the more risqué and wild nature of some of the Highschool DxD characters. Her friendship with Issei could start off rocky but then develop into a strong bond as they train together to improve their respective powers.