Well, in many of these fanfictions, the theme of the power struggle can be seen. If atsushi has some special abilities, the kidnappers may try to control or use them. There's also the theme of hope. Despite being in a difficult situation, atsushi might hold onto hope and that can be a central theme. Additionally, themes related to the loyalty of his friends who will stop at nothing to get him back are quite common too.
In 'atsushi kidnapped' fanfiction, a frequent theme is the mystery surrounding the kidnapping. Who did it and why? Writers often explore this aspect. Also, there could be themes related to character development. For example, atsushi might learn something new about himself or his relationships during the ordeal. Sometimes, there can be themes of betrayal if someone close to atsushi is involved in the kidnapping in some way.
One common theme could be the rescue. Other characters might band together to save atsushi. Another theme could be atsushi's inner strength while being kidnapped, like how he copes with the situation mentally.
One common theme is the OC helping Murasakibara grow as a person. Since he has his own quirks and insecurities in the original story, the OC can be written as a positive influence on him.
One common theme could be his struggle. Since Atsushi has a difficult past in the original story, in 'child atsushi fanfic', it might show his struggle as a child, like dealing with hardships in the orphanage.
I'm not sure about specific 'atsushi kidnapped' fanfiction directly. But you can try searching on popular fanfiction websites like Archive of Our Own. Just use the keywords 'atsushi kidnapped' in their search bar, and you might find some relevant works.
Another theme is mutual understanding. Given their different personalities, how they come to understand each other on a deeper level is frequently written about. Himuro's more outgoing nature and Murasakibara's laid - back attitude make for an interesting dynamic in this regard.
In atsushi time travel fanfiction, Ranpo can be a great character to pair with Atsushi. Ranpo's super - detective abilities can play an important role when they are in different time periods. Chuuya is also a popular choice. His powerful ability and his connection to the Port Mafia can add a lot of drama to the story. And Yosano is another one. Her ability to heal and her strong personality can make for some interesting interactions with Atsushi during time travel.
One common theme is mentorship. Dazai often acts as a mentor to Atsushi, guiding him in the use of his ability and in navigating the complex world they live in. Another theme is friendship. Despite their differences, they form a strong bond of friendship that is often explored in these fanfictions.
The theme of redemption can be found in many of these fanfictions. Dazai, with his past sins and his current state of mind, might be seen as on a path of redemption, and Atsushi can play a part in that. Atsushi's pure - hearted nature can inspire Dazai to be a better person. Additionally, the theme of trust is important. Given Dazai's unpredictable nature, Atsushi has to learn to trust him, and Dazai has to decide whether he can trust Atsushi as well.
One common theme is the test of their relationship. When kidnapped, Percy and Annabeth have to rely on each other more than ever, which shows the strength of their bond.
The theme of good vs evil is also prevalent. The kidnapping is often the work of an evil force in Narnia, and the story then follows the kidnapped character and their allies as they fight against this evil. This is in line with the overall theme of the Narnia series where good ultimately triumphs.
Another theme is the power dynamics. Usually, the kidnapper has power over the kidnapped. But in the context of a love story, this power dynamic can shift and become more equal as the relationship progresses. This can create a lot of tension and drama in the plot.