Yes, there are quite a few. You can start by looking on fanfiction platforms like Archive of Our Own. There are some really creative takes on Percy being half - dragon in those stories, often exploring his new abilities and how it changes his relationships with other characters.
One common theme is identity. Percy has to figure out how being half - dragon fits into who he is. Another is power and control. With dragon - like abilities, he has to learn to manage them.
They might develop their relationship through shared experiences. For example, if they both get lost in an uncharted area, they have to rely on each other to survive. The half - dragon could use its natural instincts to find food and shelter, while Hiccup uses his intelligence to figure out how to get back home. This mutual dependence would strengthen their bond. Also, they could communicate through body language and simple sounds at first, gradually developing a deeper understanding of each other as time passes.
One common theme is self - discovery. Astrid often has to figure out who she is and how to balance her two natures. Another theme is acceptance, both self - acceptance and acceptance from others in the story.
In such fanfiction, Hiccup being half dragon often leads to unique adventures and challenges. His mixed heritage might give him special powers or put him in conflict with both human and dragon societies.
One common theme is identity struggle. Percy has to figure out who he is now that he's half - monster. Another theme could be acceptance, both self - acceptance and acceptance from his friends and the wider community in the story. And there's often the theme of power, like how his new half - monster status affects his powers and abilities.
The betrayal of Percy by Camp Half - Blood in fanfiction can also be a way to show Percy's growth and resilience. He has to face the ones he considered family turning against him. This can lead to some really interesting character development arcs, where Percy has to re - evaluate his loyalties and find new allies or even learn to rely more on his own strength.
There is a fanfiction called 'Astrid: Dragon - Human Hybrid'. This story focuses on Astrid's unique abilities that come from being half - dragon and half - human. It has a lot of exciting action scenes where she uses her dragon - like strength and human intelligence to overcome challenges.
His relationship with Annabeth could be strained. She might be initially afraid of the changes in Percy due to his demon half. However, over time, as she sees that he's still the same Percy at heart, they could work through it and their relationship could become even stronger as they face this new challenge together.