One idea could be a story where Zero and Kiryu meet in an unexpected place, like a foreign city during a festival. They initially don't recognize each other but feel an instant connection. As they start to interact, they gradually discover their shared past and fall deeper in love. Another plot could involve Zero getting into trouble and Kiryu being the only one who can save him, which strengthens their bond.
Perhaps in the fanfiction, Zero and Kiryu both get cursed by an ancient magic. The curse gives them some of each other's traits while also weakening their own original powers. This forces them to rely on each other more than ever. They go on a quest to find the source of the curse and reverse it. Along the way, they learn about each other's pasts, values, and what really drives them, leading to a deep friendship or respect for one another.
Kiryu could be given a mission to infiltrate a powerful vampire clan in a fanfiction. He would have to disguise himself and navigate their complex social structure, all while trying to gather information for the good of the humans. This would put him in many dangerous and interesting situations.
Well, in this type of fanfiction, time - locked mysteries are a cool plot device. For instance, there could be a mystery that has been unsolved for ages, and time travel allows the character to go back to the time when it all started to uncover the truth. Prophetic dreams or visions that lead to time travel are also seen. A character might have a dream about a past event that they feel compelled to change, so they find a way to travel back in time. Additionally, the idea of time - displaced abilities is used. When a character travels through time, they might gain or lose certain abilities depending on the time period they are in, which adds an interesting layer to the story.
One idea could be that the patient zero OC has a unique ability to heal others despite being the origin of a disease. This creates a moral dilemma within the story as people are both afraid and in need of their power.
One interesting plot idea could be exploring the backstories of the characters in more depth. For example, delving into how they got their powers in this Sub Zero setting. Another could be a new villain emerging and the team having to adapt their fighting styles.
One idea could be a crossover of Naruto's world and the Familar of Zero world where Naruto has to learn the magic system in the new world. Maybe he teams up with Saito from Familar of Zero to fight a common enemy.
Well, they could be on a quest to find a lost ancient artifact. Along the way, they face various bandit groups. Zero uses his sniper skills to take out enemies from a distance, while Maya's phaselock helps in close - quarters combat. Their journey could also involve solving ancient riddles related to the artifact.
Perhaps in the fanfiction, the Zero Tails is a manifestation of the negative emotions of the ninja world as a whole. A group of young ninjas discover this and they try to find a way to purify the Zero Tails. They seek the help of old sages and learn ancient jutsu to attempt this purification, which could lead to a battle against those who want to keep the Zero Tails as a weapon of mass destruction.
Another plot could involve Ultraman Zero crossing over to a post - apocalyptic Earth. He finds a group of survivors who are fighting against mutated monsters. Zero has to use his powers not only to defeat the monsters but also to help the survivors rebuild their society, teaching them about hope and perseverance.
Well, a plot could center around a time - travel aspect. Imagine if a character from the present in Vampire Knight Zero accidentally travels back to a crucial point in the vampire - human history. They could then change some events that have a ripple effect on the current story. Or, a fanfiction could be about a secret society within the vampire world that has been hidden from the main characters. This society could have its own rules and goals that conflict with what the protagonists believe. Additionally, a story about a curse that affects not only vampires but also humans in a unique way could be really engaging.