If Klaus turns Elena into a vampire in fanfiction, it changes the story's pacing and themes. The pacing might speed up as Elena has to quickly adapt to her new vampire life. The themes of mortality and morality that were present when she was human would be replaced with themes of power and self - discovery. She would start to question what it means to be a vampire, especially one turned by Klaus. Her interactions with other vampires would be different too. She might find herself drawn to other vampires who were turned by Klaus, forming a new kind of family or group within the vampire community.
When Klaus turns Elena into a vampire in fanfiction, the story's tone might change. It could become darker as Elena grapples with her new nature. The fanfiction could explore her internal struggle between her old human values and her new vampire instincts. Her friends might form a sort of support group for her, or they could turn against her out of fear. Also, the plot could involve Elena trying to find a way to reverse the transformation, or she could embrace it and seek revenge on those who had previously wronged her in her human life. There are so many directions the story could go.
The story changes a lot. For one, Elena's place in the supernatural world shifts. She goes from being a target of vampires to being one of them. This means she's now part of the 'in - crowd' in a way. Her daily routine would be completely different. Instead of going to school during the day, she'd be prowling at night. And her relationships with the other characters would be redefined. Stefan and Damon would have to see her in a new light, and she might start to have a different understanding of Klaus too, not just as a threat but as someone who has given her a new kind of life.
Well, in the fanfiction world, if Klaus turns Elena into a vampire, she would probably have a whole new set of challenges. Firstly, she'd have to deal with her new bloodlust. Elena, being a very empathetic person, might struggle a great deal with the urge to feed on humans. Also, her relationships with her friends would change drastically. Her human friends like Bonnie and Caroline might be a bit wary of her at first. And her relationship with Damon and Stefan would also be on a different level. Damon might see her as a more equal partner in the vampire world, while Stefan might worry about her losing her humanity.
She's likely to be defiant at first. Elena has a strong will, so she would probably resist Klaus's orders and try to escape.
Katherine turning Elena into a vampire changes her life in many ways. For one, Elena's diet changes. She has to resist the urge to feed on humans. Socially, she becomes an outcast among normal humans. Her perception of the world also changes. She starts to see the vampire society in a different light and has to find her place within it.
In the long run, their relationship could either end in tragedy or a strange kind of harmony. If Caroline fully embraces her vampire side and Klaus' ways, they could become a powerful couple in the vampire world. But if she resists too much or if Klaus' enemies target her because of their connection, it could lead to a lot of heartache and conflict between them.
She could be terrified at first. After all, Klaus is a very powerful and dangerous vampire. But Elena is also a strong - willed character. So she might quickly gather her courage and start looking for ways to escape.
The pregnancy could bring them closer together. They'd be forced to rely on each other more. Klaus would protect Elena more fiercely, and Elena might start to understand Klaus better. For example, she could see the vulnerability behind his tough exterior as he worries about the future of their child. This could lead to a deeper emotional connection between them.
Caroline, for example, might be more accepting as she is also a vampire. She could help Elena adjust to her new life. Damon, on the other hand, might be jealous or feel threatened that Stefan made Elena a vampire. It could change the power balance between the three of them.
In such a fanfiction, a lot could unfold. Elena might face conflicts with other supernatural beings or have internal battles with her morality as a vampire. Also, there could be romantic complications with the people in her life.
There are fanfictions where Elena and Klaus are thrown into an alternate universe. In this universe, they are the only two vampires left and have to figure out how to survive and repopulate the vampire race. This forces them to work together closely and, over time, they develop feelings for each other that are far from the hatred they initially had in the original Vampire Diaries storyline.
One idea could be that Klaus, after being away for a long time, returns to Mystic Falls and finds Elena in a difficult situation. He decides to help her out of a sense of an old, unspoken connection. As they spend time together, they start to understand each other better and a relationship begins to form.