Perhaps it was a human who was unaware of her vampire nature. The whole situation could be very complicated as she tries to figure out if she should tell him about the pregnancy and her true self.
It could be another vampire that she met in secret. Maybe he was passing through town and they had a brief encounter, and now she's left to deal with the pregnancy on her own.
There's also the possibility that it was a powerful vampire elder. In this case, the babysitter might be in a lot of danger during her pregnancy, as there could be political or power - play reasons behind the pregnancy that she doesn't fully understand.
Maybe the vampire's pregnancy is the result of a unique vampire ritual. The babysitter has to figure out how to raise a half - vampire baby in a human world. She could start to teach the kids she babysits some vampire - friendly things to prepare them for the new addition.
Another fanfiction concept could involve a character from 'My Babysitter's a Vampire' getting involved in the ninja world of 'Naruto'. Maybe Benny could travel to the Hidden Leaf Village. He would be really intrigued by the different jutsus and might try to learn some of them, while also introducing the idea of vampires to the ninjas. This could lead to some really interesting interactions and training sessions between the two groups of characters.
One way to find great Ethan vampire fanfiction is to join relevant fan groups on social media. Fans often share their favorite stories. Some fanfictions might delve into Ethan's relationships with other characters in the 'My Babysitter's a Vampire' universe from a vampire - centric perspective. They could explore his powers in more detail or create new storylines around his vampiric nature.
A nosy neighbor character could be great. They might suspect something strange about the gender - swapped vampire babysitter and start poking around. It adds an element of mystery and danger as the babysitter has to be extra careful not to be discovered.
Definitely the babysitter. Writers can explore her backstory, her struggles with being a vampire and trying to fit into the human world while babysitting. The main kid she babysits is also a popular choice. He's the one who has the most interactions with the babysitter and often gets into crazy situations because of her vampire nature. Also, any of the villainous vampires from the show can be fun to write about, as they can add a lot of drama to the fanfiction.
Obviously, Erica's sister is a main character. And we can expect characters from the original 'My Babysitter's a Vampire' series to be involved as well, like the babysitter who is often in the middle of the vampire - related chaos. There may also be other vampires and humans who interact with Erica's sister throughout the story.
One great Vampire Benny fanfiction is 'Benny's Hidden Powers'. It really delves into Benny's character and his unique vampire abilities. The story has some exciting plot twists that keep you hooked from start to finish.
Perhaps an unknown entity from a different realm. Loki might have had an encounter during one of his travels to other worlds, and this being's powers or nature caused the pregnancy. It could be a powerful magical being that Loki underestimated, and now he has to deal with the consequences.
It could also be someone new, a character created specifically for the fanfiction. Maybe a powerful new demigod who catches Annabeth's eye, and their relationship leads to the pregnancy.
It could be a long - lost love from Mavis's past. Maybe someone she thought she'd never see again but who re - enters her life right before she discovers she's pregnant.