Who are some potential crossover characters in Highschool DxD Dragonborn fanfiction?

A heroic knight from a medieval - themed anime. He could be transported to the Highschool DxD world and, due to his chivalrous nature, attract the female characters. He might initially be at odds with the devils but eventually form a bond with the main character and become part of the harem as he adapts to the new world.

A futa version of Rias could be an interesting main character. She could have all of Rias's charm and leadership skills, but with the added element of her futa nature, which could lead to different power manifestations and relationship developments, especially with Issei.

Obviously, the third devil would be a main character. But also, characters like Issei could still play a major role. They might interact with the third devil in various ways, such as training together or getting into conflicts. Another potential main character could be a new character that you introduce specifically for this fanfiction. Maybe a mysterious transfer student who has some connection to the third devil's past or powers.

Sir Integra from Hellsing could interact with the higher - ups in the devil society of Highschool DxD. They would likely have diplomatic meetings to discuss how to deal with threats that cross over between their two worlds. Integra would be firm and no - nonsense, which could either earn her respect or cause some friction with the devils who are used to a more complex power - play based society.

A new magical teacher could be added. This teacher could have a special connection to Kuroka, perhaps knowing about her past in ways others don't. They could guide her in her magical studies and also add some mystery to the story.

An exiled God. He was banished from his own pantheon for some misdeed. In the Highschool DxD world, he is trying to find a way to redeem himself. He has unique powers that are different from the other characters, and his story could be one of redemption and self - discovery as he interacts with the devils, angels, and fallen angels in the story.

Perhaps a plot where the dragonborn has to adapt to the modern world of Highschool DxD while also hiding their true nature. They might struggle with the different social norms and also have to keep their dragon powers a secret from most people, except for maybe Issei and his friends who could help them fit in.

A human student with latent supernatural powers could be added. This character could befriend Gasper and his harem, and their discovery of their powers could be a major plot point. They might also cause some jealousy within the harem as they get closer to Gasper.

A mysterious transfer student could be added. This student could have a hidden power or a special connection to the harem queen's past. For example, she might be from a long - lost clan that has some sort of prophecy related to the harem.

Rias from Highschool DxD is likely to be a popular choice in crossovers. Her status as a powerful devil and her leadership role can make for some exciting scenarios when combined with the Persona 3 universe. Another popular character could be Aigis from Persona 3. Her robotic nature and combat abilities can be quite interesting when pitted against the supernatural beings in Highschool DxD.