In fanfiction, Yuu's character might be developed by showing his vulnerability more when it comes to Shinoa. For example, he could be more open about his fears and insecurities around her. Shinoa, on the other hand, could be developed by showing her softer side towards Yuu. She might let down her tough - girl facade and be more affectionate.
You can try fanfiction websites like Archive of Our Own (AO3). There are usually a lot of works related to Yuu and Shinoa from Owari no Seraph there. Just search for their names on the site.
One interesting plot could be Yuu and Shinoa getting separated during a dangerous mission against the vampires. Yuu goes on a solo journey to find Shinoa, facing many challenges along the way. He has to battle powerful vampires and also deal with his own inner demons. When he finally finds Shinoa, they realize their bond has grown even stronger.
One popular theme is their relationship development. Fans often explore how their bond grows over time, from being comrades to something more. Another theme is adventure. Writers might create scenarios where Yuu and Shinoa go on special missions together, facing various challenges and enemies.
In 'Seraph of the End' fanfiction, Yuu and Shinoa's relationship is often complex and dynamic. They have a unique bond that is formed through their shared experiences in the post - apocalyptic world. Yuu's brash and determined nature contrasts with Shinoa's more calculated and sometimes mysterious demeanor, which makes their interactions full of tension and potential for growth.
A popular fanfic in this pairing is 'Shinoa's Perspective on Yuu'. In this story, it's told from Shinoa's point of view, which gives a deeper understanding of her feelings for Yuu. It shows her internal struggles as she tries to come to terms with her growing affection while also dealing with the chaos around them.
In Owari no Seraph fanfiction, Mika and Yuu's relationship is complex and deep. They have a strong bond that has been through many trials. Mika is often very protective of Yuu, and Yuu in turn cares a great deal about Mika. Their relationship can be seen as a mix of brotherly love and something more profound, which is often explored in different ways in fanfiction.
One popular theme is the exploration of their friendship in extreme situations. How they support each other when facing powerful enemies in the Owari no Seraph universe.
Love and friendship are also common themes. The female Yuu may form new friendships or fall in love in ways that are different from the male Yuu. These relationships can be a driving force in the story, either helping her grow as a character or presenting new challenges. Additionally, themes of survival in the harsh world of Owari no Seraph are present, with the female Yuu having to use her wits and strength to stay alive.
In 'Seraph of the End Shinoa x Yuu fanfics', the theme of trust is really important. They live in a world where they can't trust many people easily. So, showing how they build trust in each other can be a great theme. And there's also the theme of redemption. If one of them has made some mistakes in the past, the other can be the catalyst for their redemption, which makes for a very interesting story.