Maybe she was in a wild party scene and can't remember. Or it could be that she had multiple flings and can't pin it down.
There could be several reasons. Maybe she was in a state of confusion or under the influence of something at the time. Or perhaps she had brief encounters with multiple potential fathers and it's hard to determine which one it is.
The kidnapper could be an estranged family member of Beckett. There might be some family feud or inheritance issue that leads them to believe that by kidnapping the baby, they can gain an upper hand. Or it could be a completely random person who has a mental disorder and randomly targeted Beckett and the baby because they saw them as an easy target.
One possible plotline could be that the baby has some sort of special ability or is in some way connected to a mystery they have to solve. Maybe the baby's birth coincides with a strange series of events in the city, and Castle and Beckett have to use their skills to protect the baby and figure out what's going on.
The parents of the Beckett baby would surely be main characters. They would be in a state of panic and desperation, driving the story forward with their search for their child.
One possible plot for a 'beckett baby kidnapped fanfic' is that the kidnapper leaves behind strange clues. These clues lead the family and the authorities on a wild goose chase at first. As they start to piece things together, they realize that the kidnapping is part of a larger conspiracy. The family has to face many challenges and overcome their own personal demons while trying to get the baby back.
He could be ambitious. Maybe his ambition got in the way of their relationship. For example, if he was too focused on his career and didn't have enough time for Beckett. Also, he could be possessive. Some relationships in fanfics end because one person is too possessive, which makes the other feel suffocated.
One possible reason could be a change in character development that diverges from the original show's trajectory. Maybe in the fanfiction, the writer wants to explore new relationship dynamics where Castle has different feelings. Another reason might be to create conflict for the plot. By having Castle not love Beckett, it can lead to a series of events that test their partnership in a different way.
The fanfic could start with Castle and Beckett already having a baby. They are adjusting to their new life as parents. Beckett might struggle a bit with the lack of sleep and trying to balance work and motherhood. Castle, on the other hand, is loving every moment of being a father. He writes a new book based on their experiences of having a baby. Meanwhile, they also have to deal with some family drama, like an over - eager relative who wants to be too involved in the baby's life. But through it all, their love for each other and for their baby only grows stronger.
It could be someone Ginny had a past relationship with before Harry. Maybe an old schoolmate or a character from a side plot in the fanfiction.
In the 'white wife breed black baby story', there are several factors to consider. Firstly, interracial relationships are common nowadays, so if the white wife has a partner who is black or of black heritage, it's natural for them to have a baby with darker skin. Secondly, as mentioned before, there could be a complex genetic inheritance pattern in the family. Maybe there are some distant relatives with black ethnicity that have contributed certain genes. And thirdly, in some cases, artificial insemination with donated sperm from a black donor could also lead to such a situation.
A Castle and Beckett baby fanfic could be about their journey into parenthood. It might explore how they adjust to having a baby in their lives. For example, Castle could be super excited and start writing new stories inspired by his new family experience, while Beckett might be a bit more cautious and protective.