A frequent theme is the power of love to change. The love the villain has for the hero can make them question their entire belief system. Also, there's the theme of secrecy. Since they are from opposing sides, they often have to keep their relationship a secret, which adds a lot of tension. In some fanfictions, this secrecy is what drives the plot forward, as they try to hide their feelings from their respective allies.
A third theme could be transformation. The villain may transform into a better version of themselves. In the case of 'Twilight', Edward tries to control his vampiric instincts because of his love for Bella. His 'villainous' side related to his blood - thirsty nature is subdued by his love for her, showing how the hero's love can bring about change in the villain.
Well, 'Villain's Unlikely Love' is a great piece of fanfiction in this genre. In it, the villain has always been in the shadows, hating the hero. But as the story progresses, through various encounters and shared moments, the villain begins to see the hero in a different light. It shows how love can cross the boundaries of good and evil. The way the author portrays the gradual change in the villain's attitude towards the hero is really engaging.
One example could be 'Twilight' where Bella's relationship with Edward, the vampire, has elements of this dynamic.
One common theme is redemption. The tyrant often has to atone for his past wrongs because of the love he has found. For example, he might start to treat his subjects better or stop his cruel ways.
One common theme is redemption. The tyrant, who is often seen as a cruel character at first, may start to change due to love. Another theme could be power dynamics. The relationship between the tyrant and the other character often involves a complex play of power.
One common theme is the struggle between his monstrous nature and his new - found love. Another could be the reaction of the other characters in the IT universe to a loving Pennywise. For example, the Losers' Club might be extremely confused or even more terrified at first.
Growth is a significant theme as well. His love makes him grow as a person. He might become more empathetic, more decisive. And sometimes, the fanfiction explores the theme of destiny. Whether his love is part of his greater destiny or a deviation from it is often a question explored in these stories. For instance, his love could be what was always meant to help him fulfill his role in Camelot in a different way, or it could be a distraction that he has to overcome.
Isolation is also a theme. The Joker is usually a very isolated character, and when he falls in love, it's about how he deals with this new connection and whether he can break out of his self - imposed isolation. Also, the theme of sacrifice often comes up. He may have to sacrifice his old ways or face difficult choices to keep the person he loves safe.
One common theme is the struggle between Vegeta's Saiyan nature and his new - found love. His pride as a Saiyan often clashes with his softer emotions.
The exploration of good and evil is also a big theme. In 'Grendel', we see that the line between good and evil is not so clear. Grendel is not simply a villain, and through his story, we question what truly makes a hero or a villain. Often, these novels also deal with themes of social outcast. The characters start as outcasts, like the wrongly imprisoned Edmond Dantes, and they rise above their circumstances to become heroes.