One idea could be exploring the backstory of a minor character in the Bioshock universe. For example, a splicer's journey before they became spliced. It could show how they were once an ordinary citizen of Rapture and what led them to make the fateful decision to use ADAM. Another plot could focus on an alternate timeline where the protagonist makes different choices. Maybe they side with the wrong faction and have to deal with the consequences. A third idea is a story centered around a new type of plasmid that has unexpected effects on the user and how it impacts the power dynamics in Rapture.
A good plot for a Bioshock fanfic could be a love story set within the dark and dangerous world of Rapture. Imagine two characters from different social strata, like a Big Daddy and a Little Sister, in a relationship that defies the norms of that world. Or, you could write about a group of survivors trying to build a new society in the ruins of Rapture, facing challenges not only from the remaining splicers but also from the deteriorating infrastructure. Also, a story about a scientist who discovers a way to reverse the effects of ADAM but has to fight against the powerful forces in Rapture who want to keep the status quo for their own gain.
Well, you could do a fanfic where the main character is a journalist who sneaks into Rapture to expose its secrets. They start off believing it's a utopia but soon realize the horror beneath. As they explore, they meet different characters who help or hinder their mission. Another plot could be a prequel showing how Andrew Ryan built Rapture. It could detail his early ideals, how he recruited people, and the first signs of the problems that would later plague the city. And finally, a fanfic about a character who has the ability to control the Big Daddies and uses this power to try and bring order to the chaos of Rapture.
A plot could involve Voldemort learning about the power of ADAM in Bioshock. He sees it as a way to gain ultimate power and sends his Death Eaters to Rapture to steal it. Meanwhile, a group of Aurors follow them, and then there's a three - way battle between the Aurors, Death Eaters, and the denizens of Rapture.
Perhaps OC is from the surface world and comes to rescue Elizabeth. Along the way, they have to face the moral dilemmas of the underwater city, like whether to use the power of ADAM or not. This would create a lot of tension and character development as they journey through the dangerous and beautiful but corrupt world of Bioshock.
One idea could be exploring the backstory of a minor character in the Bioshock universe. For example, a splicer's life before becoming spliced. Maybe they were an ordinary citizen who got caught up in the chaos of Rapture. Another idea is to create an alternate ending for the game, where the protagonist makes a different choice at a crucial moment. This could lead to a completely different outcome for Rapture or Columbia.
One idea could be that Big Brother is a protector in the BioShock world, guiding Little Sister through the dangerous and strange underwater city. He helps her avoid the Splicers and find the ADAM she needs in a more ethical way, like by using his combat skills to take out the Big Daddies first so she can harvest safely.
One idea could be that the OC is a protector of the Little Sisters. He or she tries to shield them from the dangers of Rapture while also trying to understand their unique bond with the Big Daddies. Maybe the OC discovers a way to break the cycle of the Little Sisters' harvesting without harming them.
One idea could be exploring the backstory of Elizabeth more deeply. Maybe write about her life in the tower before Booker came along. Another could be a story where Booker survives the events of the game and has to deal with the aftermath in Columbia. Or perhaps a fan fiction about different versions of Columbia that exist in parallel universes.
One idea could be a crossover with another game like "The Elder Scrolls". Imagine Booker DeWitt finding himself in the world of Skyrim. He could use his skills and weapons from BioShock Infinite in a completely different fantasy setting, facing off against dragons and magic - using vigors in a new and unexpected way. Another idea might be a crossover with a science - fiction series like "Mass Effect". How would the plasmids and the genetic manipulation in BioShock Infinite interact with the biotics and advanced technology in Mass Effect? It could lead to some really cool battles and character interactions. Also, a crossover with "Alice in Wonderland" could be fascinating. Picture Elizabeth falling down the rabbit hole into Wonderland. Her ability to open tears could have a really interesting impact on the strange and dream - like world of Wonderland, perhaps creating new areas or changing the rules of the land.
One idea could be that a character from another universe gets transported into the BioShock world and has to team up with a Big Daddy. Maybe they start off as enemies, but as they face common threats like the Splicers, they form an unlikely alliance. The Big Daddy could protect the new character while they figure out how to get back to their own world.
One interesting concept could be the fusion of the Bioshock's unique and often dystopian setting with the drama and character dynamics from Total Drama. For example, the power struggles and moral dilemmas in Bioshock could be played out among the Total Drama characters. Maybe the characters have to deal with the ADAM and the Splicers in Rapture while also having their own in - group and out - group rivalries like in Total Drama.
One interesting aspect could be the exploration of the Little Brother's perspective. In the original game, their world is quite mysterious. The fanfic might delve deeper into their thoughts, fears, and hopes. For example, how they view the Big Daddies they are paired with or their understanding of the underwater world of Rapture.