The Big Daddy is a fictional character in the BioShock series of video games. Designed by 2K Boston/2K Australia, they first appeared in BioShock and were promoted heavily. A six-inch Big Daddy action figure was included in the limited edition version of the title.
Big Daddies are beings who have had their skin and organs directly grafted into atmospheric diving suits, and are armed with either a rivet gun or heavy drill. Though they make low-pitched groaning noises similar to whales, Big Daddies have no voice actor attributed to them.
They roam the underwater dystopia city of Rapture, mentally conditioned to protect the Little Sisters—little girls that harvest a substance called ADAM from corpses—thanks to a series of plasmids stripping them of their humanity and free will. The player's interactions with Big Daddies and Little Sisters have been described by developer Ken Levine as the cornerstone of the game, due to the player's need for ADAM in order to gain strength in the game. The protagonist of BioShock 2, known as Subject Delta is a prototype Big Daddy who possesses free will.
Conceived of early on as a man encased in a diving suit, the Big Daddy was designed to have "that hulking metal feel of an underwater protector, so solid not even a shotgun blast could knock him off his feet." many ideas were considered for their mobility and execution, including a wheelchair mounted version. As the designs for the individual types evolved, intricate details of the actual diving suit were worked out piece by piece, using the concept that the suits would be constructed from salvaged parts of the city. Developer Ken Levine noted that with the concept of the gatherers as little girls, it allowed the team to explore the protector role of the character and demonstrate it in a way to appeal to a real-world relationship for the player.
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Official Site: Irrational Games
Links: Wikipedia BioShock Wikia- Big Daddy Mahalo