Another motive could be for power or information. If the male has some valuable knowledge or power, the female might kidnap him to extract that from him. Maybe he knows a secret about a big corporation or a political scandal and she wants to use that to her advantage.
Love or obsession can also be motives. A female might be so in love with a male that she kidnaps him to keep him all to herself. This is often seen in some psychological thrillers where the female's love has turned into an unhealthy obsession.
In some situations, it could be related to revenge. For example, if someone has a grudge against the child's family, they might target the child as a means of getting back at the family. However, these are just some of the common motives, and each case can be very complex.
Some less - known indie fictions might also explore this theme. For instance, certain mystery novels where a female villain kidnaps a male for various motives like revenge or to gain something valuable. However, these are not as widely known as the mainstream ones mentioned before.
The motives could be revenge. Somebody who has been wronged by Deidara or the Akatsuki in general might kidnap him to get even. For example, a village that was destroyed by his explosives could seek vengeance.
One possible motive could be ransom. The kidnappers may think the girl's family is wealthy and they can get a large sum of money in exchange for her safe return.
Love or obsession could be a motive. Just like in some stories where a girl is so in love with a boy that she kidnaps him thinking it's a way to keep him close.
Love and relationships also play a major role. How the transitioning character's relationships change, whether it's romantic relationships or friendships, is often explored. Sometimes new relationships are formed as a result of the transition, and old ones may be tested or transformed in different ways.
Love is a very common theme. In many such fictions, the male and female characters fall in love, like in 'Romeo and Juliet' (which can be seen as a male - to - female story in a broad sense). Another theme is growth. For example, the female character might grow through her interactions with the male character. For instance, in 'A Walk to Remember', the female character becomes more confident and finds new meaning in life because of her relationship with the male character.
A possible motive could be revenge. Some characters who have a grudge against Lupin, perhaps because of his association with certain groups or events in the wizarding world, might kidnap him. For example, if a werewolf-hating group found out his identity, they could kidnap him to make an example out of him.
One possible motive could be to gain power. Since Goten is a Saiyan, his power could be harnessed in some way. For example, they might want to extract his ki or use his DNA for some evil experiment.
Well, in the world of kidnapped fictions, 'Kidnapped' by Robert Louis Stevenson is a classic. It follows the adventures of a young man who is kidnapped. Then there's 'The Lovely Bones' which has a central plot around the abduction and murder of a young girl, though it also delves into the afterlife and how the family copes. And 'Tell No One' has a thrilling plot that involves a man being framed and his wife's disappearance which has elements of kidnapping.