Another theme is the power dynamic between them. Stolas is a powerful demon with a high social standing, while Blitz is more of an underdog in a way. Fanfictions may play with this power dynamic, sometimes having Blitz gain power or influence in the relationship, or Stolas learning to respect Blitz's agency more. Also, there are often themes of redemption and self - discovery for both characters within the context of their relationship in these fanfictions. They might grow and change as a result of their connection to each other.
A plotline might involve them going on adventures together outside of their usual work - related tasks. They could discover new aspects of each other's personalities and grow closer as a result. Also, there could be a plotline where they face opposition from other characters in the Helluva Boss universe who don't approve of their relationship.
The contrast between their characters. Stolas is refined and powerful, while Blitz is rough around the edges and scrappy. This creates a dynamic that fans find interesting to explore in fanfiction.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, and there are likely many Stolas x Blitz fanfictions there. Just use the search function on the site.
Magic and the supernatural are often themes as well. Stolas has powerful magic abilities, and fanfics play with how he uses them, discovers new powers, or how his magic affects his relationships. Some fanfics also explore the origin of his magic and how it ties to his family's history.
There's 'Stolas and His Daughter'. This fanfic focuses on Stolas' relationship with his daughter. It shows his more tender side and how he tries to be a good father in the complex world he lives in. It's a heartwarming read.
Well, 'Ao Haru Ride' is a great anime and the idea of a Kou x Futaba fanfic can be really interesting. A good fanfic in this pairing might explore their relationship further. It could delve into their feelings that were not fully shown in the anime, like the small moments of hesitation or the unspoken words between them.
Friendship is a very common theme. Their relationship, whether it's starting as rivals or comrades, often develops into a deep and meaningful friendship. Another theme is growth. They both grow as characters through their interactions with each other.
One popular 'Ao no Exorcist Shura x Yukio' fanfic is 'Bond of Shadows'. It delves deep into their complex relationship, exploring how Shura's tough exterior softens around Yukio. Another great one is 'Unspoken Ties' which focuses on their shared experiences in the exorcist world and how it brings them closer. There's also 'A Different Kind of Bond' that shows their relationship evolving in a unique way as they face various challenges together.
One common theme is adventure. Since Eureka Seven AO is set in a rather adventurous world, the fanfics often involve the reader going on exciting adventures with AO. Another theme is friendship and loyalty, as they face challenges together and rely on each other.