The struggle between good and evil is a prevalent theme. Dark Willow is on the edge of this spectrum, and fanfictions often show her internal battle. Additionally, the theme of forgiveness. How she seeks or is granted forgiveness from those she has wronged is often a part of these stories.
Love is also a common theme. It could be her unrequited love for Tara that led her to become Dark Willow in the first place, or new relationships she forms in the fanfiction. Also, the theme of self - discovery. As she battles with her dark side, she often discovers new aspects of herself.
One common theme is the exploration of their unfulfilled relationship. In the original series, they had a bit of an interesting dynamic that fanfiction often expands on romantically.
One common theme is the exploration of their unique relationship. Given their different natures, fanfictions often explore how they come to terms with each other. Another theme is power dynamics. Willow has her magic and Spike has his vampiric powers, and stories often play around with how these powers interact.
One common theme is her struggle with power. Given her powerful magic, many fanfictions explore how she controls and uses it. For example, some stories show her learning to master her powers without being corrupted by them.
A common theme is the idea of protection. The angel often takes on the role of protecting the willow, whether it's from dark forces or from the encroachment of a human world that doesn't understand its magic. Another theme is the connection between the spiritual (the angel) and the natural (the willow). It shows how they can interact and influence each other in a fictional universe.
Love is a very common theme. Most fanfictions focus on the relationship between Willow and Kennedy, whether it's a new love or a long - standing one.
Love is a very common theme. Since they have a strong relationship in the original work, fanfictions often expand on their romantic love, showing different aspects of it.
One common theme is the struggle between good and evil. Since Willow was originally a good witch, as a vampire, she often battles her new vampire nature which is associated with evil. Another theme is redemption. Many fanfictions explore whether Vampire Willow can be redeemed and return to her former self or at least find a new moral path. Power is also a theme, as being a vampire gives her new powers and she has to learn to control and use them.
Friendship is a very common theme. Buffy and Willow have a strong bond in the series, and fanfictions often explore the depths of that friendship, how they rely on each other in tough times.
One common theme is the exploration of their relationship dynamics. Since they might have different personalities, fanfictions often delve into how they interact, argue, and make up.
Friendship and alliances are common too. In crossovers like with the Buffyverse and other shows, Willow forms new friendships or alliances. For example, if she crosses over into the Star Trek universe, she might have to work with the crew of the Enterprise to solve a problem. These new relationships add depth to the story and show different sides of Willow's personality.