The Akatsuki members might be main characters in such fanfiction. Their mysterious nature and powerful abilities make them suitable for plots involving hypnosis and doujutsu. For example, Itachi with his Mangekyou Sharingan could be involved in hypnosis - related storylines, either using it against his enemies or being a victim of someone else's hypnosis - enhanced doujutsu.
Naruto himself is often involved. His strong will and determination could make him either a target of hypnosis or someone who has to resist it. Sasuke is also a likely candidate, given his powerful doujutsu, the Sharingan. Hypnosis could potentially be used to manipulate his actions or unlock hidden aspects of his Sharingan powers.
Naruto is usually a main character as he has a connection with the Kyuubi. Since he already has the Kyuubi sealed within him, it's logical that he would be the one to potentially unlock or develop the Kyuubi doujutsu. Sasuke might also be involved. His rivalry with Naruto could lead to interesting interactions in relation to the doujutsu, either trying to obtain it for himself or learning to counter it.
Harry Potter himself is often involved. Writers might explore how he could be hypnotized to face his inner demons or unlock new powers. Hermione is also a popular choice as her intelligence could be enhanced or her memories explored through hypnosis.
One of the main characters could be Hinata. Since she has the Byakugan, a fanfiction might explore the idea of her evolving it into a godlike doujutsu. Another character could be Madara Uchiha. His return in some form and obtaining a godlike doujutsu would be an interesting plot point. And of course, there could be mysterious, unnamed characters that are the center of the story in the fanfiction, with their godlike doujutsu being the main focus.
Definitely Midoriya. He's such a central figure that it's easy to imagine how hypnosis could play into his story. He could be hypnotized to doubt his own abilities or, on the flip side, be hypnotized to unlock new levels of his quirk. Ochaco Uraraka is another character who could be involved. Her zero - gravity quirk could be manipulated through hypnosis. For example, she could be hypnotized to lose control of her quirk in a dangerous situation or be made to use it in a more powerful and unexpected way.
Hermione Granger might also be a key character. She's so intelligent that she could be the one to study and figure out how to control or counter hypnosis powers. For instance, if there's a new threat in the wizarding world related to hypnosis, Hermione would be the one delving into the library to find solutions. And of course, there could be original characters created specifically for these fanfictions. These could be new students at Hogwarts who have a natural affinity for hypnosis powers and get involved in all sorts of adventures with the well - known Harry Potter characters.
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.
Naruto Uzumaki is often associated as he has ties to the Namikaze clan through his father. He could be a central character in exploring the Namikaze clan doujutsu, either as a potential wielder or someone trying to understand it. Another could be Minato Namikaze, Naruto's father. His own abilities and knowledge could be crucial in uncovering the secrets of the clan's doujutsu.
Percy Jackson himself is often a central character in such fanfics. Since he's the main protagonist of the original series, it's natural for him to be involved in hypnosis - related plots. Annabeth Chase also frequently appears, as she has a close relationship with Percy and would be involved in trying to help or understand him during a hypnotic state.
Naruto himself is often a central character in 'naruto destruction fanfiction'. Since he is the main protagonist of the original series, fanfiction writers like to put him in situations where he has to deal with destruction. Sasuke is also frequently involved as his rival, and their relationship can be explored in the context of destruction, like if they have to work together to stop a greater threat of destruction.
Well, Naruto is obviously a main character in most of these. But there could also be Sasuke. He might be either an ally or an adversary in relation to the dagger. For example, if the dagger has a power that can either be used for good or evil, Sasuke could be tempted by its darker potential.