In fanfiction, the relationship between Yui and Ruki can be complex. Ruki often has a dominant personality. He might be seen as initially cold towards Yui but gradually developing deeper feelings. In some fanfictions, Yui's innocence acts as a contrast to Ruki's more calculating nature, leading to interesting interactions.
Fanfiction often delves into the psychological aspects of their relationship. Ruki has his own past traumas that shape his behavior towards Yui. Yui, on the other hand, is in a strange new world with vampires. Their relationship development can be a journey of self - discovery for both. They learn about themselves through their interactions with each other. In many fanfictions, this exploration of their inner selves while being in a relationship is what draws readers in.
Another theme is Yui's struggle to adapt to Kanato's ways. Yui is usually portrayed as a more innocent character, and in the relationship with Kanato, she has to deal with his erratic behavior and the overall dark and dangerous environment of the Diabolik Lovers world. So many fanfics focus on her journey in this regard.
Love and redemption are common themes. Usually, Subaru has a tortured past and Yui's love is seen as a way to redeem him. For example, in many fanfics, Yui's kindness slowly breaks through Subaru's tough exterior.
A common theme is the struggle for independence within the relationship. Yui may strive to maintain her own identity while being in a relationship with Ayato. Also, the idea of redemption can be a theme. Ayato, as a vampire with a sometimes dark nature, may seek redemption through his relationship with Yui. And of course, the theme of forbidden love, given the differences between a vampire and a human, is very common in 'diabolik lovers ayato x yui fanfic'.
One idea could be that the female OC is a new student at the school. She has a special power that she doesn't fully understand yet. Yui befriends her, and together they try to figure out the secrets of the Sakamaki brothers. The OC's power might attract the brothers' attention in different ways, some being more menacing and some being more curious.
One possible plot could be that Yui discovers a long - forgotten part of Shu's past. Maybe she stumbles upon an old diary in the Sakamaki mansion that reveals some deep - seated fears or dreams of Shu's from his human days. As she tries to understand him better through this discovery, their relationship deepens in a more profound and emotional way.
Sure. You can start by looking on platforms like FanFiction.net. There are often a variety of fanfics about Ayato and Yui in the 'Diabolik Lovers' universe. Some might focus on their relationship development, from the initial encounter full of mystery and tension to a deeper emotional connection. Another option is Archive of Our Own (AO3), which has a large collection as well. Just search for 'diabolik lovers ayato x yui' and you'll find many interesting stories.
One great fanfic you could look for is 'A New Beginning for Ayato and Yui'. It beautifully explores their relationship after Yui discovers she is pregnant. It delves into how Ayato, who was initially shocked, gradually becomes a very protective and loving partner. The story also shows Yui's strength as she prepares for motherhood in such a complex world of Diabolik Lovers.
One great fanfic could be where Yui and Ayato go on an adventure outside the Sakamaki mansion. They might encounter some other supernatural beings and have to rely on each other to survive. Ayato could show his protective side towards Yui in a more dangerous and unfamiliar setting.