Issei could be an interesting main character in a 'Highschool DxD Akatsuki' fanfiction. He already has his own journey in the Highschool DxD world, and if he were to interact with the Akatsuki, it would add a whole new dimension to his story. He could learn new techniques from them or even form an alliance against a common enemy.
If Spawn were to interact with the main characters, he would bring a whole new level of seriousness. He has a dark past and a lot of baggage. When it comes to Issei's goal of becoming a harem king, Spawn might find it absurd but also interesting in a way. He could offer his own perspective on power and how to use it responsibly, which would be a contrast to the more carefree attitude of some of the Highschool DxD characters. And with the other characters like Akeno and Koneko, he'd be sizing them up, trying to figure out if they're threats or allies.
A new character could be introduced as the main character. For instance, a transfer student who has this hypnotic power. He could be mysterious at first, and as he gets involved with the harem, he gradually reveals his true self and the reasons behind his power.
It could be one of the well - known kamen riders like Kamen Rider Decade. Since he has the ability to travel through different worlds, it would be plausible for him to end up in the world of Highschool DxD. He could use his powers to adapt to the new environment and deal with the various challenges there.
Issei would be a popular choice. Since he is the main character in the original series, having him time travel would create many interesting storylines. He could use his knowledge of future events and his growth as a character to change things in the past.
It could be an original character created just for the fanfiction. Maybe a nerdy gamer who has always dreamed of being in a world like Highschool DxD and suddenly finds himself there with incredible powers.
MetaTron in Highschool DxD fanfiction can be a really interesting character. Often, fanfiction writers might explore his powers in new ways. For example, they could give him enhanced abilities compared to his original form in the Highschool DxD lore. His role might also be changed from a more background or secondary character to a central figure driving the plot. This could involve him having unique interactions with the main characters like Issei and Rias.
Ulquiorra is a very interesting character to analyze in Highschool DxD fanfiction. His stoic and often emotionless nature from his original Bleach series can create some really unique interactions in the Highschool DxD universe. For example, his power level and combat skills would likely make him a formidable force in the DxD world. His unique Hollow abilities could be adapted in various ways, like his Cero could be seen as a more powerful version of a devil's attack.
Well, first there's Issei. He's the protagonist, a former human turned devil. Rias Gremory is really important. She's a powerful devil and kind of Issei's mentor in the devil world. Akeno is also a main character. She has a unique personality and is close to Rias. Kiba Yuuto, he's a skilled swordsman among the devils. And Xenovia is interesting too. She starts as an exorcist but then her path crosses with Issei and the others, which changes things for her.
Akeno Himejima is also a key character. She is one of Rias' peerage members and has a complex personality. Koneko Toujou, a cat - like devil, is part of the group as well. She has a strong fighting ability and an interesting backstory.