Overcoming differences is another theme. Since the two universes have distinct cultures, abilities, and species, fanfics often show how characters learn to accept and work with those differences. This could be a human from RWBY learning about the dragons in HTTYD or vice versa.
Since 'lemon' fanfics are inappropriate, we can talk about common themes in regular Hiccup and Astrid fanfics. One common theme is their partnership in dragon - training and leading Berk. Another is their evolving romantic relationship, from initial attraction to deep love.
Another theme is self - discovery. The child in the fanfic is usually on a journey, both literally and metaphorically. As they interact with the dragon and other characters in the How to Train Your Dragon world, they learn more about themselves, their strengths and weaknesses.
One common theme is redemption. Dagur has had a complex past, and many fanfics explore how the reader can be part of his journey towards redemption.
Another theme is growth. In many fanfics, both Hiccup and Ruffnut grow as individuals while also growing closer as a couple. For example, Hiccup might help Ruffnut see the value in strategy, and Ruffnut might help Hiccup be more bold and take risks. There are often adventures that they go through together which contribute to this growth. Also, the theme of acceptance is prevalent. They accept each other's flaws and quirks, which is a big part of their relationship development.
One popular RWBY HTTYD fanfic is 'Dragon Riders of Remnant'. It combines the unique elements of both universes really well. The characters from RWBY interact with dragons in a way that stays true to their original personalities.
Well, a frequent theme is the struggle for acceptance. Since the dragon is in an anthro form, it may face challenges in being accepted by both the dragon and human communities. This can lead to stories of self - discovery and finding one's place in the world. Also, adventure themes are common, where the anthro dragon and its human companions go on quests, face villains, and overcome obstacles together.
One common theme is the exploration of Tukson's true nature. Since he was not fully developed in the original RWBY, fanfics often dig deeper into who he really was. Another theme is his relationship with the other characters in the RWBY world, whether it's friendship, rivalry, or something else.
One common theme is family. Since Weiss and Winter are sisters, a lot of fanfics explore their family dynamic, like how they support or misunderstand each other.
A common theme is power struggle. Lucifer, being a powerful figure, often gets into power - related conflicts with the RWBY characters who also possess various forms of power.
One common theme is identity. Since Neo has a rather mysterious past, many fanfics explore who she really is. Another is revenge. Given her actions in the RWBY series, some fanfics have her seeking revenge or others seeking revenge on her.