In a crossover scenario, the rules of both universes might be muddled. Bella could be in a situation where she has no other choice but to kill Mikael. For instance, if Mikael is part of a prophecy that would bring about the end of the world in a way that she can prevent only by his death. Or perhaps Mikael has wronged Bella personally in some way within the fan - created plot, like he has kidnapped someone close to her or tried to harm her directly, and she retaliates by killing him.
It could be that Mikael has some sort of power or knowledge that Bella doesn't want him to use. If he's planning something evil or dangerous in the context of the fanfiction, Bella might decide to eliminate him to prevent chaos or harm. For example, if he's about to release a powerful dark force that would destroy both her world and the world he comes from. Another possibility is that Bella has been manipulated into believing that Mikael is a greater evil than he actually is, perhaps by an antagonist who wants Mikael out of the way for their own reasons.
I'm not sure of specific 'bella kills mikael crossover fanfiction' stories off - hand. You could try searching on popular fanfiction websites like Archive of Our Own. They have a vast collection of crossover fanfics and you might find what you're looking for there.
One common theme is the idea of redemption. Mikael, who might be seen as a villain in some original stories, often gets a chance at redemption through his relationship with Bella. Another theme is the discovery of new powers or abilities. They might discover something unique about themselves when they are together.
One great 'bella and mikael fanfiction' could be 'Bella's New Beginning with Mikael'. In this story, Bella, who might be a character from a known series, meets Mikael in an unexpected situation. They start off as strangers but gradually develop a deep connection as they face various challenges together. It's full of interesting dialogues and character development.
Sure. One popular Mikael and Bella fanfiction is 'Mikael's Redemption'. In this story, Mikael has a change of heart towards Bella and they end up forming an unlikely alliance. Another one could be 'Bella and Mikael: A New Beginning' where they both discover new powers together and use them to protect their world.
Some smaller, more niche fanfiction communities might also have 'bella and mikael fanfiction'. You can search for forums or groups dedicated to the fandoms that Bella and Mikael might be associated with. These communities often have their own collections or recommendations for such fanfictions.
There might be a fanfiction where Bella's presence softens Mikael's cold heart. Maybe she shows him a different way of life, away from all the bloodshed and vengeance he's used to. In this story, their relationship could be a slow - burn, full of tension and gradual understanding.
It could be revenge. If the human had wronged Bella in some way, like harming her family or friends in the fanfiction world, she might be driven to kill out of a sense of vengeance. Or perhaps she is forced into a situation where killing seems like the only option to protect a greater good, like saving a whole community from a dangerous human.
Their relationship could start with mistrust. Mikael is a dangerous vampire hunter and Bella is involved with vampires. But as they get to know each other's motives, they might start to respect each other.
One possible motive could be jealousy. If Mike has feelings for Bella and she is interested in someone else, like Edward in the Twilight series, he might be driven by envy to attack her.
Power could be a motive. She might want to have control over the vampire world or the humans in Forks. So she starts doing villainous things to gain that power.