Another aspect could be the relationship development. The kidnapped character and Sirius might start off as enemies or strangers, but through the events of the kidnapping, they come to understand each other better. There could be a lot of tension and conflict at first, but as they interact more, a bond forms.
Well, usually there's a lot of tension and mystery. The kidnapper's motives and the victim's attempts to escape are common elements.
A popular plot device is the discovery of a 'hidden truth'. For example, Sirius might find out that there is some sort of family connection or prophecy that makes him think he should be on Voldemort's side. Another common one is the use of a love interest. Maybe a Death Eater or someone close to Voldemort seduces Sirius into joining. And sometimes, it could be a situation where Sirius is desperate and feels that Voldemort is the only way to achieve a certain goal, like saving someone he loves who is in danger from another source.
Typically, these manhwa explore the captive's fear and the kidnapper's complex motives. There's also a lot of tension-building and unexpected plot twists.
Often, it explores power dynamics and the emotional bond that forms between the characters during the kidnapping situation.
Common themes also include the captive's internal struggle. They are kidnapped by these good - looking captors, but they have their own loyalties and values. This creates an inner conflict. As for plot devices, the appearance of a third party can be crucial. It could be someone trying to rescue the captive or another group that has a different agenda with the captors. This third - party element can further complicate the relationships and the overall plot of the fanfiction.
The theme of freedom is quite important too. Sirius was locked up in Azkaban for a long time, and when he escaped, he was fighting for his freedom. Fanfictions often expand on this, showing his journey to fully regain his freedom and his place in the wizarding world, while also dealing with the prejudice against him because of his supposed crimes.
The theme of redemption also shows up. Since Sirius had a somewhat 'tainted' reputation in the eyes of the Black family, some fanfictions explore if Orion could have played a role in his redemption or if Sirius could have redeemed the family name in Orion's eyes.
One major theme is dealing with loss. Given Sirius's fate in the original story, his goddaughter in fanfiction often has to cope with his absence. This can lead to themes of grief, but also of finding strength in the face of it. Also, themes of magic discovery are common. She might discover new magical abilities or old family magic related to her connection to Sirius.
Another plot device could be the revelation of a long - lost prophecy or a secret document. This prophecy or document might have the key to proving Sirius's innocence. It could be something that was deliberately hidden by the villains who framed him. Once it is discovered, it provides all the necessary evidence to clear his name, such as a prediction that Sirius would be wrongly accused and the real perpetrator would be revealed in a certain way.
One common theme is family. Since Sirius comes from the Black family, stories often explore how his child is related to the family's complex history, traditions, and dark secrets.