A really interesting concept could be that the reader is from the future. They accidentally time - travel to the world of 'Yona of the Dawn'. With their knowledge of future technologies (even if it's just basic things like making better tents or more efficient ways to store food), they contribute to Yona's cause. The reader could also introduce new ideas about leadership and equality that are ahead of their time in the 'Yona of the Dawn' world.
Well, you could write a fanfiction where the reader is a spirit - like being that only Yona can see. This being gives Yona advice and support in her toughest times. Or perhaps the reader is a lost warrior who has forgotten their past, and Yona's group helps them regain their memories while they, in turn, help the group with their combat skills.
An OC with a special power related to nature could join Yona's journey. For example, the OC can communicate with animals and help the group in various situations like finding hidden paths or warning about approaching danger. This would add an interesting dynamic to the group as they face different challenges. The OC could also have a backstory about how they discovered their power and why they decided to use it to help others.
A third plot idea could be to focus on the bond between the dragons and Yona from the dragons' perspective. What do they really think of her? Do they have any doubts about following her at times? This could create some internal conflict within the group. You could also explore how their bond might change or grow stronger over time, especially in the face of new challenges that test their loyalty to each other.
Maybe a male OC who is a healer. He joins Yona's group and uses his unique healing abilities to help the team in various situations. He also has a crush on one of the female characters in the group, which adds some romantic sub - plot.
One plot idea could be the OC dragon having a unique bond with Yona. Maybe it's a dragon that was thought to be lost or forgotten, and it has special powers that help Yona in her journey, like the ability to sense danger from afar.
First, decide on the role of the reader in the story. Are they a friend, a helper, or something more? Then, think about the setting. Will it be in one of the existing locations in the 'Yona of the Dawn' world or a new place? After that, just start writing the first encounter between the reader and Yona or her group. For example, you could start with the reader saving one of Yona's friends from a dangerous situation.
Maybe a scenario where the reader is lost in the forest and Hak finds them. They could have a heart - to - heart conversation as he leads them back to safety. This would show his caring side and also allow for some character development between them.
A fanfiction could be set in a parallel universe where Zeno and Shin - ah are the main characters instead of Yona. They could be on a mission to find a cure for Shin - ah's dragon powers that are slowly consuming him. Zeno, with his immortality, would stop at nothing to save his friend.
One common theme is adventure. Since the original story has a lot of adventure elements, fanfics often continue this. Yona and Hak go on quests together, facing enemies and exploring new lands, which strengthens their bond.
Some fanfics also explore the idea of a 'what if' scenario where Hak didn't grow up with Yona. How would they meet and fall in love in a completely different context? This allows for a lot of creative storytelling as the writers can re - imagine their first encounters and the development of their relationship from scratch.
One popular 'Yona of the Dawn Yona x Hak fanfic' is 'The Journey Ahead' which beautifully explores their relationship as they face various challenges together. It has great character development and a lot of sweet moments between Yona and Hak.