One common theme is redemption. The 'dark savior' often has a past filled with wrongdoings and is seeking to make up for it. Another theme is isolation, as their actions and nature may set them apart from others. And power struggle is also common, as they may have to fight against those who oppose their way of 'saving'.
In 'Dark Hermione and Dark Bellatrix fanfiction', a common theme is the transformation of character. Hermione, who is typically seen as a good and studious witch, undergoes a significant change to become darker. Bellatrix, on the other hand, may also have her own form of transformation as she interacts with this new, different Hermione. Another important theme is the exploration of the wizarding world's underbelly. These fanfictions often take readers into the parts of the wizarding world that are not so well - known, filled with dark magic and dangerous secrets. It's an exciting way to see the familiar world of Harry Potter from a completely different perspective.
Power corruption is a common theme. Many 'dark potter fanfiction' stories explore how the power of magic can corrupt even the purest of hearts, like Harry's. Another theme is the blurring of good and evil. They often show that the line between the two isn't as clear - cut as it seems in the original books.
One common theme is the exploration of Spike's inner darkness. Writers often focus on his more sinister qualities and how they developed.
One common theme is the corruption of power. Korra has great power, and in dark fanfiction, it can often be shown as being misused or leading her astray. For example, she might use her bending abilities in ways that harm others instead of help them.
One common theme is the struggle between light and dark within the elvlyn. Since they are 'dark' elvlyn, there is often a battle within them to either embrace their darker nature or seek a path towards the light. Another theme is isolation. They are often portrayed as outcasts in their own society or among other races.
One common theme is the struggle between good and evil within Lucifer himself. He is often depicted as a complex character who has both the capacity for great darkness but also some remnants of his former angelic self. Another theme is the exploration of power. Since Lucifer is a powerful being, his use and abuse of power in a dark context is often explored.
One common theme is the struggle between good and evil within Walter. It often shows how his darker side battles with any remaining goodness.
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.
Well, identity is a big theme. The Dark Swan often has to figure out who she really is, especially when she has this dual nature. Also, redemption is a theme that pops up. Some fanfictions show her trying to make up for her dark actions. Love and relationships are also common themes, like how her dark side affects her relationships with others. For example, in some stories, her friends or family might be afraid of her new dark self, and she has to deal with that.
One common theme is the corruption of Aang's pure heart. Since he was the Avatar, a symbol of peace and balance, seeing him corrupted by dark forces creates a strong contrast. Another theme is the struggle between light and dark within him. He has to fight his own inner demons.