Another theme is power. As a female vampire, Yuu has certain powers. Fanfictions might explore how she discovers and controls these powers. Sometimes she may face challenges from other vampires who are jealous of her power or want to use her for their own gain.
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.
One common theme is the struggle between their different natures. Since Yuu is a demon and Mika is a vampire, there's often a conflict and a need to overcome their natural instincts to be together.
Another theme is sacrifice. In many fanfictions, either Mika or Yuu is willing to sacrifice themselves for the other's well - being. For example, they might put themselves in danger to protect the other from harm.
The theme of redemption can also be found in some kanda yuu crossover fanfiction. Maybe he has made mistakes in his original world, and the crossover gives him a chance to atone for them in a new setting. Or he meets characters who need his help to redeem themselves, and through that process, his own character evolves. It adds depth to the stories and makes the character of Kanda Yuu more multi - dimensional.
I don't really support or promote lemon fanfiction due to its often inappropriate nature. But generally, in non - appropriate fanfictions, common themes might be about their relationship dynamics in an overly sexualized way which is not suitable for public discussion.
A theme of redemption can also be found. Yuu Kanda may try to make up for things he's done in the past or seek forgiveness. In some fanfictions, he goes on a journey to atone for his actions, which makes for a very engaging read as it shows his growth and development as a character.
There is also a fanfiction where Yuu, the female vampire, falls in love with a human. It shows how she tries to balance her vampire instincts with her feelings for this human, and the conflicts that arise from their different natures. It's really interesting as it delves deep into the emotional aspects of a vampire - human relationship.
One common theme is friendship. Yuu and the reader often start as friends and then the relationship may develop further. Another theme is the shared love for beyblade. Their passion for the sport brings them together and forms a strong bond.
One common theme is possessiveness. As Mika is the yandere in this pairing, he often shows extreme possessiveness over Yuu. He doesn't like Yuu being close to others and will go to great lengths to keep Yuu to himself.
One common theme is loyalty. Mika's possessiveness can be seen as an extreme form of loyalty towards Yuu. Another theme is protection. Since Mika is possessive, he often tries to protect Yuu from any harm. And there's also the theme of jealousy. If other characters get too close to Yuu, Mika's possessive nature will make him jealous.