Rias Gremory could also be a main character. Her relationship with Issei and her role as a devil leader means she can play a crucial part in fanfictions about the One Winged Angel. She might be involved in helping Issei master the form or dealing with the consequences of its appearance.
There could be antagonists like Kokabiel who might be more prominent in these fanfictions. His interest in powerful forms like the One Winged Angel could drive the conflict in the story, as he tries to either obtain it for himself or prevent Issei from fully realizing its potential.
Obviously, Escanor is a main character. He is often the center of the story due to his powerful presence. In addition, characters from the original Highschool DxD like Issei might also be involved. Issei could be a friend or a rival to Escanor in the fanfiction, adding an interesting dynamic as Issei is known for his own growth and development in the original series.
Issei is often involved as he is one of the central characters in the Highschool DxD universe. His character can be greatly influenced by hypnosis, either being the one using it or being affected by it.
Issei is often involved. Since he has a connection to the Gremory family through Rias, his actions and decisions can sometimes be a part of the Gremory - bashing scenarios. Another could be Sona, as her family has a relationship with the Gremorys and she might be in a position where she has to take a stance against them in some fan - created situations.
Some fanfictions might focus on the emotional aspect of the One Winged Angel. How does the character who has this form deal with the power, the isolation it might bring, or the new relationships that form as a result of it? This can add a lot of depth to the story.
Naruto would obviously be one of the main characters, as it's Naruto - related fanfiction. He would be the one to gain the One Winged Angel powers. Sasuke could also be a major character. His rivalry with Naruto might take on a new dimension with Naruto's new form. Sakura could be involved too, perhaps helping Naruto control his new powers.
In this fanfiction, Naruto is the central figure. However, other important characters could be antagonists. Maybe there are some dark angels or demons who oppose Naruto's newfound status as a one - winged angel. His friends from the original Naruto series, such as Shikamaru, Choji, and Ino, might also play significant roles. They could be the ones who try to understand Naruto's transformation and support him through the difficulties that come with being a one - winged angel.
Rias Gremory is often a popular character in such fanfics. Given her central role in the original Highschool DxD series, her relationship with Issei could be explored in the context of a pregnancy. Her status as a devil and the leader of her peerage would add a lot of complexity to the story if she were to become pregnant.
The dragonborn himself is, of course, a main character in these fanfictions. Depending on the story, other DxD characters like Akeno Himejima could also be involved. She has her own powers and personality, and her interactions with the dragonborn can add a lot of depth to the story. Her seductive nature might play off against the dragonborn's more straightforward and perhaps stoic personality.
Well, considering the nature of 'highschool dxd', characters like Xenovia could be involved in the 'ultimate hypnotism fanfiction'. Her strong will and combat skills might make her a target for hypnotism to be subdued or she could be the one trying to resist hypnotic control. Also, Asia, with her kind and gentle nature, could be a character that gets caught up in the hypnotism plot, either being hypnotized to do things against her will or being the one to break free from it and help others.
Issei is often a central character in these fanfictions. Since he is the main protagonist in the original series, his relationships and potential betrayals are explored. For example, a situation where his friends or allies in the Occult Research Club turn against him for some reason, like jealousy over his growing power or a misunderstanding about his actions.