Little Sisters

Rapture (also known as the North Atlantic Project, or simply the Rapture Undersea Colony) is a massive underwater metropolis forged from the childhood dreams of Andrew Ryan, a wealthy American/Belarusian industrialist meant to serve as an escape from the political, social, and religious constraints of a reeling post-World War II world. It was first established on November 5, 1946, and the construction of the city itself was finished in late 1951.[1] It is located within the northern Atlantic Ocean at 63° 2' N, 29° 55' W, approximately 433 kilometers west of Reykjavik, the capital of Iceland.

Little Sisters are young girls who have been genetically altered and mentally conditioned to reclaim ADAM from corpses around Rapture. Little Sisters are almost always accompanied by a Big Daddy. They generally are immune to damage, outside of being "harvested," and have no offensive abilities. Attacking them, however, will incur the wrath of their Big Daddy protectors.

Big Daddies (originally named Protectors, and occasionally referred to as Mister Bubbles or Mister B. by Little Sisters and Metal Daddies or Tin Daddies by Splicers) are genetically enhanced human beings who have had their skin and organs grafted into an armored diving suit, with the Alpha Series being an apparent exception to the grafting process, though still heavily spliced. Their primary purpose is to protect Little Sisters while escorting them around Rapture.

Alpha Series Experiments were conducted by Dr. Gilbert Alexander in the research laboratories of Fontaine Futuristics. The first protector prototypes bonded to Little Sisters were called the Alpha Series, comprised of previous plasmid test subjects from Sinclair Solutions. Alexander took inspiration from a common nickname for the Protector Program candidates, "Big Daddies," and engineered a conditioned bond between the Protectors and their charges that would mimic, through mental and physical restraints, the emotional bond between a father and his daughter, the "Pair Bond."[7] This bond ensured that the Protectors would guard their charges at all times and not wander away from the girls; otherwise they would slip into a coma.

Protector Bond Breakthrough Suchong's genetic Protection Bond attempt proved a failure as the Big Daddies still ignored the girls. While he fussed over this, unbeknownst to him, Elizabeth provided the solution to two Little Sisters in his own laboratory: inject a dying Big Daddy with ADAM to save him. This caused the Bouncer to bond with both Little Sisters, Leta and Masha Lutz, and the girls went to tell Suchong about what happened. However, Suchong, deep in his work and increasingly frustrated, failed to notice the Big Daddy's change in behavior and smacked Leta away during a recording of his failed Lot 255 results. This triggered the aggressive response of the Bouncer, who then impaled Suchong with his drill to the scientist's own desk, proving that the bond had worked but at the cost of Suchong's life.

"A murder occurs in a Safe Zone, and {{user}} investigates. The case leads to Gray Areas and Dark Sectors, revealing an intentional sabotage of Rapture's balance. Big Daddies play a crucial role in the climax, with peace restored but cracks remaining."