One possible analysis could be that it allows for a more personalized take on the 'Owari no Seraph' universe. OC (original character) fanfictions often bring in new storylines and character dynamics. It might explore relationships between the existing characters in the series and the newly created OC in unique ways, such as a romantic relationship or a friendship that changes the course of the story.
The theme of identity is quite prevalent in such fanfictions. The OC has to figure out who they are in this new and often dangerous world of 'Owari no Seraph'. Are they going to be a hero, a villain, or something in between? Another theme that can't be ignored is survival. The world of 'Owari no Seraph' is full of threats, and the OC has to find ways to survive. This can lead to some really exciting adventure - like storylines where the OC has to use their wits and any special abilities they might have.
Some 'owari no seraph fanfiction' stories might be about alternate endings. What if the main characters made different choices? For instance, if Yuichiro decided to fully embrace his vampire side instead of fighting against it, how would that change the entire story? Writers can take this concept and create really engaging and thought - provoking fanfictions.
One common theme is the clash of different power systems. In Naruto, there are ninjutsu and chakra, while in Owari no Seraph there are vampire powers and cursed gear. Fanfictions often explore how these powers interact when the two universes collide. Another theme is friendship across different worlds. Characters from Naruto and Owari no Seraph have to learn to trust and cooperate with each other.
One common theme is survival. Given the post - apocalyptic setting of 'Owari no Seraph', many oc fanfictions focus on how the original characters endure and fight for their lives. Another theme is friendship. The oc often forms strong bonds with the existing characters, like Yuuichiro and Mikaela. For example, in some fanfictions, the oc and Yuuichiro help each other in battles and grow to trust each other deeply.
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.
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.