Well, first of all, they are both complex characters from an already popular series. Azriel has his own demons and a dark past, while Gwyn has overcome great trauma. In fanfics, their stories can intersect in really powerful ways. For example, they can heal each other's emotional wounds. Also, the setting in which they exist, with all the magic and intrigue, provides a great backdrop for their relationship to develop. They can have adventures together, and their different abilities can complement each other, which is very appealing to readers who love to see characters grow together in a relationship.
One popular gwyn and azriel fanfiction might be 'The Bond Beyond Wings'. It delves into their relationship as they train together and slowly discover their feelings for each other. Another could be 'Gwyn and Azriel's Secret Meetings' which focuses on their clandestine encounters and how they build trust in a world full of secrets.
One popular Azriel and Gwyn fanfic is 'Shadows and Starlight'. It beautifully explores their relationship as they train together. Another great one is 'Gwyn's Ascent' which delves into Gwyn's growth and her bond with Azriel. And 'Azriel's Solace' shows how they find comfort in each other's company.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). Just type 'gwyn and azriel' in the search bar, and a whole list of relevant fanfictions will pop up. You can also check out Tumblr, where many fans share their favorite gwyn and azriel fanfiction stories and might even recommend some that are not as well - known.
The theme of self - discovery also frequently appears. As their relationship develops, both Elain and Azriel discover new sides of themselves. For example, Elain might find a new strength within her because of Azriel's belief in her, and Azriel might open up more about his past traumas due to Elain's kindness.
One of the common themes is the exploration of their individual powers and how they complement each other. Azriel with his shadows and Elain with her seer abilities. Fanfics might show how they use their powers together or how their powers influence their relationship. Also, redemption is sometimes a theme. Maybe Azriel has some past mistakes he wants to make up for in relation to Elain, or Elain has to redeem herself in Azriel's eyes. And of course, the theme of self - discovery. As they get closer, they learn more about themselves.
One common theme is redemption. Often, either Azriel or Eris is portrayed as seeking redemption in some way, whether it's for past actions or for their family's reputation. Another theme is rivalry - turned - friendship. Their initial animosity towards each other slowly morphs into a form of respect and friendship in many fanfics.
One common theme is adventure. The reader often goes on exciting quests or missions with Azriel. For example, they might explore a mysterious new land in Prythian together.
Love and loyalty are also common themes. The love between the characters, whether it's platonic or something more, and their loyalty to one another are frequently depicted. In some fanfics, they have to prove their loyalty in the face of danger or betrayal. Additionally, power and its consequences can be a theme. Given their powerful natures, how they handle power and the results of their actions regarding power are explored.
Fanfiction.net is also a good place. There are often some talented writers who post their 'azriel mate fanfic' there. However, you might need to do a bit more searching compared to AO3 as the tagging system isn't as refined.