One common theme is family. Since Klaus comes from a complex family in the Vampire Diaries universe, many fanfics about baby Klaus explore his family relationships. Another theme is his emerging powers. Writers often like to play with how his powers might have started to show when he was a baby.
Love is a very common theme. The love between Klaus and the OC is often explored, especially how it deepens with the arrival of a baby. It's about their journey of falling in love all over again as they take on the role of parents.
One common theme could be protection. With Klaus being a powerful but also very much hunted character, protecting the baby from his enemies would be crucial. Another theme might be family. How the baby fits into the already complex family structure of the Originals.
One common theme is redemption. Klaus is often depicted as seeking redemption through his relationship with Bonnie. Another theme is the power dynamic. Bonnie has her own powerful magic, and Klaus is a powerful hybrid, and their powers play a role in how they interact. For example, they might be in a situation where they need to combine their powers.
A common theme is the clash of two different worlds. Since Hermione is from the wizarding world of 'Harry Potter' and Klaus is from the vampire world of 'The Vampire Diaries', there's often exploration of how their different powers and cultures interact.
One common theme is the power dynamic. Klaus is often a powerful character, and the relationship with the reader explores how they interact with that power. For example, the reader might be in a position of vulnerability at first but then find their own strength.
One common theme could be family. Since they are likely related in the original context, exploring their family bonds in different ways can be a big part of the fanfic. Another might be friendship, showing how they become closer as friends despite any differences.
One common theme could be friendship. Since it's about Bex Taylor - Klaus, their relationship whether as friends or comrades might be explored.
Redemption is also a theme. Klaus has done many bad things, and in some fanfics, Elena becomes a catalyst for his redemption. It shows how their relationship can change him for the better.
One common theme is innocence. Since it's about baby Sasuke, it often shows his pure and innocent state before all the tragedies. Another theme is family bonds, especially with his parents and brother.
Another theme is innocence. Baby kitsune are often depicted as pure - hearted and innocent beings. Their interactions with other characters are usually based on this innocence, like befriending other animals or magical creatures without any ulterior motives. They can also be very curious, which is another aspect related to their innocence. In some fanfics, their curiosity leads them into all sorts of adventures and misadventures. And they also often face challenges that test their innocence, such as dealing with mean - spirited characters but still maintaining their good - natured selves.