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.
Some Tumblr blogs are also dedicated to sharing and discussing Owari no Seraph fanfictions. You can search for relevant tags like #YuuAndShinoaFanfiction or #OwariNoSeraphFanfic. These blogs might have links to or reviews of some interesting fanfictions.
Another place could be FanFiction.net. Many fans post their stories about different anime characters there. So, it's quite possible to find some good Yuu and Shinoa fanfictions. However, the quality may vary, so you might need to read through a few to find the ones you like.
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.
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.
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.
Well, Tumblr can also be a good source. There are many fanfiction writers who post their works there, sometimes in a more serialized or snippet - like form. You might need to use the search function and look for relevant tags such as '#owari no seraph', '#asuramaru x yuu'. Additionally, some dedicated 'Owari no Seraph' fan forums may have fanfiction sections where you can find some great stories about Asuramaru and Yuu.
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.
You can try fanfiction.net. It has a large collection of 'owari no seraph fanfiction'. There are stories sorted by different categories such as romance, adventure, etc.
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.