One possible plot could be that Karin Maaka, who already has some vampire - like qualities, discovers a hidden power within herself that fully turns her into a true vampire. She might struggle with the new urges and powers at first. For example, the thirst for blood could be a major conflict for her, especially if she has moral objections to harming others to satisfy it. Maybe she meets other true vampires who either help or hinder her journey of self - discovery in her new form.
The plot could involve Karin Maaka being turned into a true vampire against her will. She then has to figure out how to reverse the process. Along the way, she uncovers secrets about the vampire world that she never knew before. This could include things like ancient vampire clans, hidden hierarchies, and unique vampire abilities. As she delves deeper, she realizes that the key to reversing her transformation might lie in understanding the true nature of vampires.
Perhaps in the fanfiction, Karin Maaka's transformation into a true vampire is a result of a magical experiment gone wrong. Once she becomes a true vampire, she finds that she has a special connection to a particular vampire artifact. This artifact has the power to either save or destroy the vampire world. Karin, with her newfound vampire instincts and her own sense of justice, decides to take on the task of protecting the artifact from those who would use it for evil purposes, all while coming to terms with her new vampire self.
If Karin Maaka turns into a true vampire, her relationships with her human friends would likely change drastically. They might be afraid of her new vampire nature, especially if they see her display vampire traits like super strength or a thirst for blood. Her family might also be in shock and try to find a way to 'cure' her. However, she might form new relationships with other vampires who understand what she's going through and can guide her in the vampire world.
The fanfiction could go like this. Sonic is on a mission in a spooky, abandoned town. Unbeknownst to him, it's infested with vampires. One of them manages to turn him into a vampire. At first, Sonic is horrified. His appearance changes slightly, with paler fur and redder eyes. He has to learn to live with his new condition. His friends like Tails and Knuckles are confused and a bit scared. However, Sonic discovers that being a vampire gives him the ability to sense danger from afar. He then uses this to his advantage to protect the town and his friends from an even greater evil that's lurking in the shadows. Eventually, he might find a way to reverse the transformation and return to his normal self.
In a 'Harry turns into a vampire' fanfiction, the story could start with Harry being cursed by a powerful and ancient spell that turns him into a vampire. His friends at Hogwarts are initially scared and unsure how to deal with him. However, Harry is determined to find a way to reverse the transformation. Along the way, he discovers that there are some positive aspects to being a vampire, such as heightened senses that help him in his detective - like investigations into the origin of the curse.
Perhaps Tsukune is turned into a vampire as part of a ritual gone wrong. In the fanfiction, he could be the key to some prophecy that the vampires are trying to fulfill. As he turns, he starts to have visions related to the prophecy. He then has to decide whether to embrace his new vampire self or fight against it to protect his non - vampire friends.
One possible plot could be that Kol turns Davina into a vampire out of love. He doesn't want to lose her to mortality. Davina, at first, is horrified as she has always been on the side of the witches. But as she starts to experience her new vampire powers, she begins to see the world in a different light. She and Kol then have to face the wrath of the witch community who see her transformation as a betrayal.
One possible plot could be Dawn's struggle to control her new vampire instincts while still maintaining her relationships with the Scooby Gang. She might have to hide her transformation from Buffy at first, leading to a lot of internal conflict.
They might also have a time - travel adventure. Imagine they find an old, enchanted object that sends them back in time to a period when vampires were more feared and hunted. They would have to navigate this new and dangerous time while also trying to find a way back to their own time. Karin could use her modern - day knowledge to help them survive, while Ren could use his wits to blend in.
One possible plot could be that Naruto, in this fanfiction, realizes Karin's strength and her unique personality. He starts to date her to understand her better. They might go on missions together and during those, their relationship deepens. For example, they could be on a mission to rescue a kidnapped shinobi. Karin uses her sensing abilities to track the enemy, and Naruto is impressed by her skills. This leads to more romantic moments between them.
In this kind of fanfiction, perhaps Naruto saves Karin from some dangerous enemies. For example, Karin might be captured by a group of rogue ninjas, and Naruto, with his strong sense of justice and powerful ninja skills, comes to her rescue. He could use his Rasengan or his shadow clone jutsu to fight off the bad guys and free Karin.
One possible plot could be that they accidentally get pregnant and then have to deal with the reactions of their friends and the ninja world. There could be a lot of drama as they try to figure out how to handle the situation while also facing their own personal feelings for each other.