One great 'Game of Thrones Arthur Dayne fanfic' is 'The Legend of Arthur Dayne: Dawn of the Knight'. It delves deep into his backstory, showing his training days at the Citadel. It's really interesting as it gives a different perspective on his character compared to what we see in the show.
Another reason is that Arthur Dayne represents a certain ideal of knighthood. In fanfics, writers can further develop this ideal. They can show his honor, his code of conduct, and how he influenced the world around him. This makes for very engaging reading for fans of the series.
One possible fanfiction could start with Arthur Dayne's son being raised in secret. He discovers his father's legacy through an old sword. He decides to train hard to become as great a swordsman as his father was, facing many challenges along the way.
The plot could be about his search for justice. His father was a great knight, and he feels the need to right the wrongs in the world. Maybe he discovers a conspiracy related to his father's death and sets out to expose it.
Ned Stark is often paired with Ashara Dayne. Their connection has always been a topic of much speculation in the 'Game of Thrones' fandom, so it's natural that fanfiction writers explore their relationship further.
The focus on the Dayne's sword, Dawn. In many fanfictions, Dawn is not just a sword but a symbol with great power and a long history that is often explored in detail.
Another fanfiction idea could revolve around Ashara Dayne's life in Starfall. It could show her daily life, her training with the sword, and her relationships with her family members. It might also explore how the events in the rest of Westeros affect her and her home.
He could go on a quest to find a lost Valyrian steel sword. This would take him across the Seven Kingdoms, facing various challenges like bandits, wild animals, and rival claimants to the sword. He might also have to solve ancient riddles related to the sword's location.
One possible love interest could be a noble lady from another house. For example, a Stark girl. The contrast between the Dayne's southern charm and the Stark's northern stoicism could create an interesting dynamic.
One great fanfic could be about Arthur Dayne and Elia Martell meeting in a diplomatic event in Dorne. They start off as strangers but gradually come to respect each other's cultures and skills. In this fanfic, their conversations are filled with the subtleties of Westerosi politics and the different values of the North and Dorne.