Big Daddy

Big Daddies are genetically-enhanced human beings who have had their skin and organs grafted into an enormous diving suit. The candidates also go through voice box modification and pheromone application. This pheromone is what attracts the Little Sisters to the Big Daddies. They are then placed in large vats with a substance that effectively turns them into mindless drones. With gene splicing, the humans inside the suits were given enhanced strength and agility. Their suits are made mostly of steel and contain life support machinery to keep them alive during their duties and they function as exoskeletons; allowing them to lift heavy weights with ease. The suit also gives them the ability to resist deep ocean pressure to a depth of six miles. Big Daddies are sometimes assigned and outfitted to do other constructive tasks around Rapture. Big Daddies have been seen doing repairs and other maintenance tasks both inside and directly outside the city.

The Big Daddy was the brainchild of Dr. Yi Suchong. Knowing that the Little Sisters would be at great risk if they were out on the streets gathering ADAM with no protection, Suchong sought to rectify the problem. With much trepidation, he presented his idea to Andrew Ryan. Knowing that becoming a Big Daddy would be a "one-way street", Suchong fretted about finding suitable candidates, despite Ryan's assurances that it would not be a problem. Although the true identities of the candidates are unknown, it is probable that they are either criminals, supporters of Atlas, victims of Ryan's mind control pheromones etc.

Big Daddies communicate by haunting sounds similar to that of a whale's call. For easier interpretation, lights were added to the helmet to display what state of intention the Big Daddy is in. Big Daddy helmets have three light colors: green indicates the Big Daddy is hypnotized and friendly, yellow indicates awareness of but indifference to his environment, and red indicates a rage towards assailants.

Bouncer


Bouncers are clad in a basic heavy diving suit, the entire torso of which is covered by a high-gauge metal carapace. The head protrudes directly forward from the upper chest area, and is encased in a hemispherical helmet studded with eight lit portholes. A large, fully-functional conical drill is attached to the right arm just forward of the elbow, and is used for powerful melee attacks. The Bouncers gets their name from an attack they use, in which they strike the ground with their drills, resulting in a tremor that gives close-proximity enemies unstable footing.

Rosie


Rosies are clad in a basic heavy diving suit, the upper torso of which is covered by a high-gauge metal carapace. The head is guarded by a high-gauge metal diving helmet welded to the to the torso carapace, and has three large lit portholes. They wield large rivet guns and Proximity Mines at long range, and use the rivet gun for powerful melee attacks as well. The Rosies get their name in direct reference to Rosie the Riveter, an American motivational poster figure from the years of the Second World War.

Occasionally, Jack may see a Rosie walking on the sea floor if he looks out through the glass.

BioShock 2
Ten years later, Sofia Lamb is on the rise and she and her followers are producing new Big Daddies to help protect the Little Sisters. Bouncers and Rosies will return to the sequel, along with new types.

Subject Delta


Subject Delta is slated to be the protagonist in BioShock 2, and is the first Big Daddy to successfully bond with a Little Sister. He has some qualities of both the Rosie and the Bouncer, though unlike the other Big Daddies in Rapture, he is able to think for himself. As the prototype, he is able to use a Drill and a Rivet Gun like his Bouncer and Rosie counterparts respectively, as well as other weapons not used by Big Daddies. Subject Delta also has the ability to use plasmids, and can wield them with his weapons simultaneously. When Subject Delta kills another Big Daddy, he is given the option to adopt the Little Sister, as well as the option to harvest. Saving will eventually become an option for the player when an adopted Little Sister is brought to a Little Sister Vent. The player can still harvest her, or save her and send her to Bridgette Tenenbaum's safe house.

Rumbler


The Rumbler is the new type of Big Daddy. It will make it's debut in BioShock 2. His arsenal will include deployable Miniature Turrets and RPGs. This Big Daddy type seems to be more mobile than the other two types, although less armored. Its combat style gives it an advantage in open spaces, unlike its two counterparts, and it seems to fare well in long to mid-range combat. Its attacks are designed to keep the player on the move, and it can quickly turn the environment to its advantage and give the player as little cover as possible.

Rosie (Multiplayer)
As well as making a return in the singleplayer, the player will be able to become a Rosie by picking up a Big Daddy Suit in the multiplayer. As a Big Daddy, the player will have access to the Rosie's Rivet Gun and Proximity Mines, as well as the ability to perform a stomp which stuns nearby enemies. In the multiplayer, Rosies only have two different "moods", indicated by the light emanating from their portholes:


 * Blue Light: Indicates that the Rosie is on the player's team, and as such is friendly to them.
 * Red Light: Indicates that the Rosie is a member of the opposite team, and thus hostile to the player.

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Trivia

 * It seems that Big Daddies return to Hephaestus periodically to have maintenance check-ups, as revealed in the Running Short on R-34s audio diary.
 * As seen in the Gamespot December 4th preview, it is shown that Rosies do indeed repair Rapture, as one can see a Rosie fixing a leaking window using his Rivet Gun.
 * If the first few attempts to drive away potential threats (Jack) prove futile, Big Daddies will become enraged.