One possible fanfiction could be that Selene and Michael's pregnancy is a sign of hope for the vampire and lycan clans. Their child could be seen as a symbol of unity, bringing an end to the long - standing feud. Maybe in the story, they have to face many challenges during the pregnancy, like threats from those who oppose the union of a vampire and a lycan.
A plot twist could be that Selene and Michael's pregnancy is actually a way for an alien race (in a really out - there fanfiction idea) to take over the Underworld. The unborn child is a host for the alien consciousness. This would completely change the direction of the story, as they now not only have to deal with the normal vampire - lycan politics but also an extraterrestrial threat. It could also lead to a situation where they have to find a way to save their child from being taken over by the alien without harming the baby.
In Selene x Michael fanfics, the theme of adventure is quite common. They could be on a journey to save their world or a particular place that is important to them. Along the way, their relationship deepens. Also, the theme of redemption can be seen, where one or both of them have made mistakes in the past and their relationship helps them find a way to redeem themselves.
One common theme is the fear of the unknown. Pregnancy is a big change, and in fanfictions, they often show Selene and Michael being worried about how their lives will change and if they can be good parents.
A common theme is the relationship between Selene and the OC. It could be a friendship, a mentorship, or even a romantic relationship. For example, the OC might be a new vampire that Selene takes under her wing.
There could also be original characters created specifically for the fanfiction. These characters could be hybrids of the Naruto and Selene universes, perhaps having a mix of ninja abilities and Underworld powers. They could add new dimensions to the story and help drive the plot forward, whether as friends or foes to Naruto and Selene.
First, you need to understand the Underworld universe. Know the rules about vampires, werewolves, and the whole power dynamic. For the OC, create a unique backstory. Maybe they're a human with a special connection to the supernatural world. Then, think about how Selene would react to this new character. Their first meeting should be impactful and set the tone for their relationship.
First, you need to understand the characters. Selene is a strong, complex vampire, so you should keep her personality traits consistent. For the male reader character, decide on his background, whether he's human, vampire, or something else. Then, create a plot that brings them together. Maybe it's a shared mission or an accidental encounter.
One idea could be that Selene finds herself magically transported to the wizarding world of Harry Potter. She might initially be confused but then use her skills as a vampire to help in some sort of battle against dark wizards. For example, her enhanced speed and strength could give the Order of the Phoenix an edge in a fight.
Some fanfictions could explore the idea of Selene teaching Naruto about the secrets of the Underworld. Naruto, in turn, could show Selene his ninja way and how determination and hard work can overcome great obstacles. This could lead to a series of adventures as they explore different regions of the Underworld together.