Well, it could be that the baby daddy doesn't even know he's the father at first. The girl in the 'God Girls' decides not to tell him right away. She's worried about how he'll react and also about how it will affect her standing in the group. But as the baby grows, she starts to face more and more difficulties on her own, like financial problems. So she finally decides to reach out to the baby daddy. He, on the other hand, is shocked but then realizes he wants to be a part of the baby's life. This then sets off a series of events where they have to learn to co - parent and deal with their own feelings for each other in the midst of the Rio setting.
For the girl, maybe Zendaya would be great. She has the acting chops to portray a strong - willed young woman in Rio. As for the baby daddy, I could see Oscar Isaac. He can bring that mysterious and charming quality that the role might require. And for the 'God Girls' group, actresses like Yalitza Aparicio and Lupita Nyong'o could be part of it. They are both very talented and could add a lot of depth to the group of friends.
One popular trope is the 'enemies - to - lovers' between Rio and Beth. It adds a lot of tension and drama to the story. Another is Rio as the 'protector' in some way, even though he's a criminal. It gives an interesting twist to his character.
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.
Obviously, Danny Phantom himself could be the 'baby daddy'. His dual nature as a human and a ghost could bring a lot of interesting twists to the story of having a baby. For instance, the baby might inherit some of his ghost powers, which would create all kinds of challenges for raising the child.
Family reactions are also a big theme. Their families' responses to the baby can range from excitement to disapproval, which adds a lot of drama to the stories. And often, there's the theme of secrecy or the need to protect the baby from the more dangerous aspects of their lives. For example, they might be worried about their criminal connections affecting the baby's safety.
Well, Rio in Good Girls fanfiction can be seen in various lights. Some fanfictions might explore his backstory more deeply. For example, how he got into the criminal world in the first place. His interactions with the good girls are always a highlight. He has this alluring and dangerous quality that makes for great fanfiction material, whether it's a story about his revenge or his unexpected soft side.
Iruka sensei is another possibility. He is kind and nurturing, having already shown his care for Naruto when he was a student. As a baby daddy, he would be patient and dedicated to raising his child with good values and a love for learning.
Some specialized forums dedicated to Rio - related topics or bat - related fan creations might also be a good source. You can ask around in these forums if anyone knows of any rio baby bat fanfiction or if they have written some themselves.