One common theme is protection. Delta is there to protect the Little Sister from the various threats in Rapture.
Another theme is the relationship between innocence and corruption. The Little Sister is often seen as an innocent figure in a very corrupt world, and Delta's role is to keep that innocence intact. This can be explored in different ways in fanfiction, like how they interact with the other, more morally - gray characters in the Bioshock 2 universe.
The theme of redemption can also be present. Delta, as a Big Daddy, may be seen as a figure seeking redemption through his care for the Little Sister. He has this second chance at some form of humanity through his relationship with her, and fanfiction writers can play with this idea, showing how he tries to atone for his past (even if it's a past he doesn't fully remember) by being a good protector for the Little Sister.
The fanfiction about Bioshock 2's Delta and Little Sister often explores their unique relationship. Delta is a Big Daddy, and his bond with the Little Sister is central to the story. It might show his protective nature towards her, and how they interact in the dark and dystopian world of Rapture.
Perhaps the plot focuses on how Delta and the Little Sister survive in a post - apocalyptic Rapture. They could be on a quest to find a new source of ADAM that doesn't involve harming others. The relationship between them could be tested when they meet other Little Sisters and Delta has to decide whether to protect all of them or just his own Little Sister.
Delta's character can be developed through his moral choices when it comes to the Little Sister. For instance, if he's faced with a situation where he has to choose between the safety of the Little Sister and getting more ADAM, his decision would reveal a lot about his character. He could also learn new skills or abilities in order to better protect the Little Sister, which would show his adaptability and growth as a character.
A very common theme is redemption. Since Delta has a complex past, fanfictions often involve a female character helping him find redemption or vice versa. Another popular theme is survival. In the harsh world of Rapture, female characters in these fanfictions are often depicted trying to survive alongside Delta.
One common theme is survival. Given the harsh environment of Rapture, fanfictions often center around how the Little Brothers manage to stay alive among the splicers and other threats.
In Bioshock Little Sister fanfiction, the characterization can be really interesting. The Little Sisters are often depicted with a sense of both innocence and otherworldliness. Their relationship with the Big Daddies is a key aspect. Some fanfictions might focus on exploring their pasts before being turned into Little Sisters, adding depth to their otherwise somewhat mysterious personas.
Survival is also a frequent theme. In the dark and dangerous world of Bioshock, the Big Sister has to survive, and in fanfics, this can be explored in different ways. For example, she may face new threats or have to adapt to changing circumstances in Rapture. Additionally, the theme of loyalty is often present. Her loyalty to Rapture or to certain individuals can be a major plot point, especially when it is tested.
I'm not sure if you've heard of the fanfiction 'Delta's Female Protege'. It's about a young girl who looks up to Delta and tries to follow in his footsteps. The story is filled with action and emotional moments. It also gives a great view of the Rapture environment from a different angle compared to the original game.
A memorable scene might be the discovery of a Little Sister's hidden memories. In some fanfictions, as the story unfolds, we see the Little Sister recall her life before becoming what she is. This moment of realization, often filled with both sadness and a glimmer of hope, is really powerful. It gives readers a deeper understanding of her character and the tragedy that has befallen her.
The Big Daddy can symbolize brute force and unwavering loyalty in fanfiction. He is this hulking, armored figure that will stop at nothing to protect the Little Sister. The Little Sister, in turn, can symbolize innocence lost. She is a child, yet she is involved in the dark and gory business of ADAM harvesting. Their relationship symbolizes the co - existence of protection and exploitation in the world of Bioshock.