Another theme is their growth together. Fanfictions often show how they help each other to become better versions of themselves. Like Adolin learning to be more in touch with his emotions because of Shallan, and Shallan becoming more confident with Adolin's support. This is often shown through different adventures or challenges they face as a couple.
One common theme is their relationship development. Writers often explore how they grow closer and understand each other better. Another is adventure. They might be put in new and exciting situations together.
One great Adolin and Shallan fanfiction is 'A New Beginning' which delves into their relationship after the events of the main series. It beautifully portrays their growth as individuals and as a couple.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfictions about various topics, including Adolin and Shallan. Fanfiction.net is also a good place. There are many talented writers who post their works there.
Another theme is the power of friendship. Their initial friendship is a strong foundation, and many fanfictions build on this, showing how their friendship evolves into a deeper, more passionate love, and how that friendship helps them face the challenges that come their way.
One common theme is the struggle between heroism and normal life. Spider - Son often has to balance being a hero and dealing with school, family, etc. For example, in many fanfictions, he misses important family events because he's out fighting crime.
Another theme is redemption. Edgeworth has a past that he sometimes feels he needs to atone for, and in fanfiction, Wright is often there to help him through that. It's like in 'The Path to Forgiveness' where Wright helps Edgeworth come to terms with his past mistakes.
Transformation is a big theme. How the character changes physically and emotionally when they turn into a werewolf is often explored. Also, the concept of the moon is very common. Since werewolves are often associated with the moon, many fanfictions use the moon as a symbol for power, change, or even as a trigger for the werewolf's transformation. There's also the theme of the werewolf's inner struggle, like trying to control their animal instincts in a human world.
One common theme is love against all odds. Often, the two characters face many obstacles in their relationship, but their love prevails.
Love is a very common theme. Most fanfictions focus on the romantic relationship between Bright and Win, showing their love in different ways.
One common theme is leadership. Since Ashe is a leader in her own right, many fanfictions explore how she manages her people and makes difficult decisions. Another theme is friendship and alliances. Ashe often has to rely on others, so stories about her making friends or forming alliances are popular. Adventure is also a common theme as Ashe goes on quests and battles enemies.