A really unique way to develop their relationship is by having them switch bodies for a short time. This would force them to understand each other's perspectives in a very literal sense. They would experience the other's powers, feelings, and daily struggles. It would be a comical and also deeply insightful journey for both of them, and it would definitely add a new dimension to their relationship in the fanfiction.
One way to develop their relationship uniquely is through time - travel. Maybe they accidentally travel back in time and have to rely on each other in a different era. They learn about each other's pasts more intimately and it strengthens their bond. In this process, they also change some small things in the past that have positive impacts on their present relationship.
They could develop a shared hobby. For instance, they both get into painting and use it as a way to express their emotions and connect on a deeper level. It would be unique because it shows a side of them that's not related to their supernatural natures.
To develop their relationship realistically, they need to start as friends. Kol could show Elena his more vulnerable side, like his past traumas as an Original. Elena, in turn, can share her own struggles with him. They should have conversations about their different views on life, death, and immortality. Then, slowly, feelings of attraction can start to develop. For example, Kol might save Elena from a dangerous situation, and she realizes she has more than just gratitude for him.
The relationship would shock Damon and Stefan. They have always been protective of Elena, and Kol has a reputation as a dangerous vampire. Damon might be especially angry and try to drive Kol away from Elena. Bonnie would also be concerned as she has seen Kol's past actions. However, Caroline might be more open - minded and could potentially try to help Elena understand her feelings for Kol. Klaus would be an interesting factor too. He might see Kol's relationship with Elena as a way to gain an advantage in his power games or he could be protective of his brother's new - found love.
In many 'The Vampire Diaries' Kol and Elena fanfictions, their relationship can be quite complex. Kol is often depicted as a wildcard, and his interactions with Elena can range from intense and dangerous to oddly alluring. Some fanfictions might explore a forbidden - love - type scenario, where Kol's vampiric nature and his family's history with Elena's friends create barriers. However, they also might find common ground in their mutual experiences of being caught up in the supernatural chaos of Mystic Falls.
Well, perhaps they could start a new life away from all the chaos in Mystic Falls. They build a home together in a far - off place and discover new abilities or powers that come with their union. For example, Elena might gain some of Kol's vampire powers in a unique way. They also face challenges like normal married couples, such as learning to live with each other's habits and quirks.
The fact that they come from different 'eras' in the vampire world could also be a problem. Kol has been around for a very long time and has different values and beliefs compared to Elena. This could lead to misunderstandings and arguments as they try to navigate their relationship.
Maybe the end would see them sacrificing their love for the greater good. They realize that their relationship is causing too much chaos in the supernatural world, and in order to save their friends and the town, they part ways. But they always carry the memories of their love with them, and in a way, it makes them stronger individuals in their respective worlds.
The other vampire clans might be antagonists. They could see the baby as a threat to the vampire hierarchy or fear that the baby will have powers that could disrupt the balance among vampires. For example, the Originals' siblings who don't trust Kol might try to stop Elena from having the baby.
One possible plot could be that Kol kidnaps Elena to use her as bait for his enemies. He might think that by having Elena in his custody, her friends, especially the Salvatores, would come to rescue her and he could then ambush them. Another idea is that Kol has some sort of vendetta against Elena because of her connection to the doppelganger bloodline. So he kidnaps her to extract revenge on the entire line.
One common theme is forbidden love. Since Kol and Elena might be from different 'worlds' or groups within the show's lore, their relationship can be seen as something that goes against the norm. Another theme could be passion. The kiss is often a moment of intense passion that drives the story forward.
Another character that could be important is Elijah. He is often the voice of reason among the Originals. He might try to guide Kol in his relationship with Elena, or he could be against it if he thinks it will bring trouble to their family. So in this fanfiction, he could be a key figure in the development of the Kol - Elena relationship.