One common theme is the 'forbidden love' aspect. Since they are from different species, there may be social or cultural barriers in their relationship. Another theme could be 'learning and acceptance', where they learn about each other's cultures and accept their differences.
Yes, there are quite a few. You can start by looking on popular fanfic websites like Archive of Our Own. Just search for'male human x female dwarf romance' and you'll find a variety of stories with different plotlines and writing styles.
A prevalent theme is the power dynamic. Orcs are often depicted as strong and powerful, so in these romances, it can be interesting to see how the power dynamic plays out between the female orc and the male human. Sometimes, the female orc might be the protector, while other times, they find a more equal footing. Adventure is also a common theme. The couple might go on adventures together, facing various challenges that test their relationship.
Transformation is also a common theme. Sometimes the male human may be in danger of being turned into a werewolf, or the female werewolf may try to suppress her werewolf side for the sake of the relationship. Additionally, the idea of loyalty is often explored. The female werewolf's loyalty to her pack and how that conflicts or aligns with her loyalty to the male human, and the male human's loyalty to the female werewolf in the face of potential danger from other humans or werewolves.
Some 'female nergigante x human' fanfics may also have a theme of transformation. Maybe the human character is influenced by the nergigante in some way, either physically or mentally, and this transformation becomes a central part of the story. It could be a slow process that changes the human's perspective on life and the world around them.
The theme of transformation can also be common. Sometimes the human might gain some dragon - like abilities or the dragon might take on more human qualities as they interact. Another theme is the struggle against society's norms. Since their relationship is not typical, they often have to fight against the expectations and prejudices of their respective species' communities. This adds a layer of drama and conflict to the fanfics.
In many of these fanfics, there is a theme of discovery. The male human discovers the world of the female wolf, which could include her natural habitat, her way of life, and her pack. And for the female wolf, she might discover the complexity of human emotions and society. There can also be a theme of transformation, where either the human takes on some wolf - like qualities or the wolf becomes more accustomed to human ways.
One common theme could be the overcoming of differences. Since an arachne is not human, there would be a lot of cultural and physical differences to work through. Another theme might be acceptance. The male human has to accept the arachne for who she is, with all her spider - like features. And of course, there's the theme of forbidden love, as such a relationship might not be considered normal in the setting of the story.
Often, there's a theme of acceptance. The two characters have to accept each other's differences, whether it's physical or cultural. Another theme is the idea of a shared adventure. They might go on a journey together and their relationship deepens during that time. Also, themes of loyalty and protectiveness are quite common as the male human might feel the need to protect the female furry in a world that may not always understand their relationship.
The theme of adaptation could be quite common too. The human might need to adapt to the strange environment or culture associated with the Tempest. Or vice versa, the Tempest might have to adapt to human ways. This can lead to interesting character developments and plot twists. There could also be themes related to friendship or even love that develop between the two, despite their differences.
Well, often there's the theme of mutual discovery. The male human discovers the dragon's world, which is full of magic and mystery that he's never known. And the female dragon, in turn, gets to know about human emotions and culture more closely. Also, a theme of protection might be present, where the dragon protects the human from various threats, creating a bond between them.