Another theme is 'redemption'. Stefan has his own dark past, and Bonnie is often portrayed as a powerful and good - hearted character. Fanfics may explore how Stefan can find redemption through his relationship with Bonnie, or how Bonnie helps him overcome his inner demons.
One common theme is love triangle. Since Bonnie, Damon and Stefan are all connected in the Vampire Diaries universe, the love triangle between them is often explored. It creates a lot of drama and tension.
One common theme is friendship. Stefan and Bonnie often start as friends in the fanfictions. For example, they might be friends first and then face challenges that make their bond stronger.
One common theme is friendship. Many Bonnie fanfics focus on Bonnie's relationships with her friends and how they support each other through various challenges.
One common theme is self - discovery. Stefan often has to figure out his own sexuality and come to terms with it. For example, in many fics, he might start off confused but gradually realize his feelings for other male characters.
Well, a big theme is 'unlikely friendship turned love'. They start as acquaintances or even enemies in some cases, and then their relationship evolves into love. 'Discovering new powers together' is also a theme. As Bonnie has her witch powers and Stefan his vampire abilities, sometimes in fanfictions they discover new ways to combine or enhance their powers when they are together. And 'protecting each other' is a theme that shows their loyalty and deepening bond.
Friendship is a common theme. Writers often show how Bonnie and Toy Bonnie become friends despite their differences. Maybe Bonnie is the more traditional character and Toy Bonnie is the new addition, and they learn to get along.
Love is a very common theme. Most fanfics explore the deep love between Bonnie and Enzo. Another theme is sacrifice. They are often in situations where they have to sacrifice something for each other or for the greater good. Also, the theme of redemption can be found in some, where they are trying to redeem themselves from past mistakes.
One common theme is power. Bonnie is a powerful witch, and many fanfics explore her powers further, like how she can gain new ones or master existing ones. Another is friendship. Since she has complex relationships in the show, fanfics often deal with her mending or strengthening friendships.
One common theme is self - discovery. Bonnie Sinclair often embarks on a journey where she learns more about herself. Another theme could be friendship, as she forms bonds with other characters in the fanfics.
One common theme is redemption. Kai is often a complex and somewhat villainous character, and many fanfics explore Bonnie's role in redeeming him. Another theme is the power of love. Their relationship is often depicted as being able to overcome differences and obstacles. For example, in many fanfics, their love helps Kai to resist his darker impulses.