Typically, there is the human female character who becomes the mother. She might be an ordinary woman who suddenly finds herself in this extraordinary situation. Then there is the alien male character, the 'baby daddy'. He could be from a technologically advanced alien race or a more primitive one, depending on the story.
There are often secondary characters like friends or family of the human female. They might be supportive, or they could be against the relationship and the idea of having an alien baby. For example, a protective brother who is worried about his sister's well - being. Also, there could be other aliens who are either allies or enemies related to the baby daddy, adding more complexity to the story.
The most common character is Gaara as it's his story of being a baby daddy. The mother of the baby is another crucial character. Depending on the plot, other characters from the Naruto world could be included. Shikamaru, being one of Gaara's acquaintances, could show up to offer his strategic advice on how to handle fatherhood. Kankuro and Temari, his siblings, might also be there to provide family support or add some family - related drama to the story. And the baby, which is at the heart of the 'baby daddy' concept, would be a central element in the interactions of all these characters.
In Naruto fanfiction, characters like Jiraiya could also be a 'baby daddy'. He was known for his womanizing ways in the series, so it's not hard to fathom a situation where he has a child. Then there's Itachi. Although his life was full of tragedy and secrecy, a fanfiction could explore a scenario where he has a child before his untimely death. And Kiba could be a character as well. His close bond with his dog Akamaru and his brash personality could lead to a situation where he becomes a 'baby daddy' in a creative fanfiction.
One interesting concept could be the unique cultural clashes between the human and alien species in terms of raising a baby. For example, the alien might have very different ideas about discipline or education compared to humans.
Edward Cullen is one of the most common baby daddies in Twilight baby daddy fanfiction. Since he's the main male lead in the original series and has a complex relationship with Bella, it's natural that many fanfiction writers explore the idea of him as a father. Jacob Black is also a popular choice. His relationship with Bella was also significant, and in some fanfictions, he could end up being the baby daddy in an alternate storyline. Another character who might be the baby daddy in some fanfictions is Aro from the Volturi. His powerful and mysterious nature makes for an interesting take on being a father in the Twilight - inspired stories.
One common theme is the shock of discovery. The wrestler suddenly finds out they're a baby daddy, which throws their life into chaos. Another theme is responsibility. They have to figure out how to be a good father while still being a WWE star.
One common theme is responsibility. The Akatsuki members, who are usually seen as tough and somewhat aloof, suddenly have to face the huge responsibility of being a father.
One common theme is redemption. Vergil, as a baby daddy, often has to make up for his past actions and become a better person for his child. Another theme is the struggle between his old life of fighting and his new role as a father.
Love and family are also very common themes. Itachi may have been a cold - blooded ninja before, but as a baby daddy, he discovers the warmth of love and the importance of family. There's also the theme of secrecy. Given his situation, he has to keep the existence of his child a secret from many people, which adds a lot of tension to the story.
Sirius Black is a very common 'daddy' character. In the original story, he was Harry's godfather, so it's easy to expand on that relationship in fanfiction. He has the potential to be a loving and protective figure for Harry.
There could also be side characters like the baby daddy's friends or family members. His best friend might be trying to convince him to either step up or run away from his responsibilities. Or his mother could be a traditional figure who has very specific ideas about how he should handle the situation, adding more conflict to the story.