Here are some plot ideas. The self - insert vampire could be a spy sent by a powerful vampire lord from another realm to study the chakra system in the Naruto world. As they live among the ninja, they start to develop feelings for them and question their loyalty to their original master. Another idea is that the vampire has the ability to see the future through blood - reading. They see a terrible disaster coming to the Naruto world and must convince the ninja, who are initially skeptical, to take action to prevent it.
A great plot idea is that the self - insert vampire is actually a lost member of a forgotten clan in the Naruto world that has vampire - like traits. They are initially feared by the other characters but gradually prove themselves to be an ally. Or perhaps the vampire is from another dimension entirely and is accidentally pulled into the Naruto universe. They then use their unique abilities to help solve a major crisis in the world, like a war or an impending doom caused by a powerful enemy.
You could insert yourself as a civilian in Naruto's world who has a special connection to the ninja world. Maybe you are a healer who doesn't use chakra in the traditional way but has some natural talent for curing diseases. This would put you in a position to interact with ninjas and get involved in some of the big events in the story.
One idea could be that your self - insert character is a new student at the Yokai Academy. They initially struggle to fit in among the various supernatural beings but gradually discover a unique power within themselves that helps them gain respect. For example, they might have the ability to communicate with spirits that others can't, which becomes useful in solving a mystery at the school.
Well, for a self insert vampire in a Naruto fanfic, you could begin by researching both vampire lore and Naruto's world. Vampires usually have some weaknesses, like sunlight or holy water. In the Naruto world, you can make these weaknesses interact with the existing elements, such as chakra. As for the self - insert, consider what kind of role you want to play. Are you a hero, a villain, or something in between? You can also introduce new jutsu related to vampire abilities, like a blood - sucking jutsu.
One plot idea could be that your self - insert character has a special ability to sense ancient power, and teams up with Robin to find a hidden Poneglyph that is said to hold the key to a great treasure. Another is that your character is from a lost civilization and has some knowledge that Robin needs to complete her research on a particular historical event. A third idea is that your self - insert gets lost in a mysterious library on an island, and Robin has to find and rescue them while also uncovering some long - lost knowledge within the library.
One idea could be inserting yourself as a new recruit with a unique power. For example, the power to manipulate time on a small scale. This could lead to interesting scenarios where you help the team solve problems that require precise timing. Another idea is to be a hacker who joins the team and has to deal with all the high - tech threats they face. You could also be a character from another dimension who accidentally ends up in the Agents of Shield universe and has to find a way back while also helping the team.
Start with an interesting hook. Maybe your self - insert character witnesses a vampire attack and becomes intrigued. Then, build up the journey towards becoming a vampire. It could involve meeting a mysterious vampire who offers the 'gift'.
Here are some plot ideas. Your self - inserted self could be a Pokémon trainer who is cursed to have Pokémon attracted to them in an unusual way, forming a harem. They must find a way to break the curse while still maintaining their relationships with the Pokémon. Another idea is that the character is a time - traveler who goes back to the early days of the Pokémon world. There, they meet Pokémon that are not yet fully understood and form a harem. The story could be about how they change the future of the Pokémon world through their relationships with these Pokémon. Also, your character could be a Pokémon whisperer who can communicate with Pokémon on a deeper level. This attracts a harem of Pokémon with special needs or powers, and they work together to help other Pokémon in the world.
One plot idea could be that your OC self - insert discovers a hidden power within themselves that is connected to an ancient prophecy in the High School DxD universe. This power makes them a target for various factions, both good and bad. Another idea is that they accidentally stumble upon a secret alliance between different species that is planning something big, and they have to decide whether to expose it or get involved.
One idea could be that your self - inserted character is a long - lost Saiyan who has unique powers. For example, the ability to control time on a small scale during battles, which would add a new dynamic to the fight scenes in the Dragon Ball Hero universe. Another plot could involve your character being from a different dimension and having to adapt to the rules and power levels of the Dragon Ball Hero world while also trying to find a way back home.
Well, you could write a female self - insert fanfiction where the character is a vampire slayer. She arrives in Mystic Falls thinking it's just a normal town, but soon realizes the truth. She has to decide whether to side with the vampires who seem to have some good in them or stick to her slayer roots and try to eradicate them all. Or, perhaps a self - insert as a siren. She uses her alluring powers to manipulate the events in Mystic Falls for her own gain, but eventually falls in love with one of the main characters and has to change her ways. Also, a self - insert as a time - traveler who accidentally lands in the Vampire Diaries' timeline and tries to fix things that have gone wrong in the past to save the future of Mystic Falls.