Big Daddy - Bouncer

Their primary purpose is to protect Little Sisters while they escort them around Rapture. Big Daddies communicate by haunting sounds similar to that of whale calls.

For easier interpretation, production model Big Daddies have a mind-controlling, bio-luminescent chemical substance which was filled into the helmet to display what state of emotion or mind that it is in. Big Daddy helmets have three light colors: green indicates that the Big Daddy is hypnotized and friendly, yellow indicates awareness but indifference to his environment, and red indicates rage towards assailants.

If the first few attempts to drive away potential threats prove futile, Big Daddies will become enraged.

Bouncers are clad in a very distinct heavy diving suit, the entire torso of which is covered by a thick 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 get their name from their will to protect their bonded Little Sisters.

Big Daddies will wander to a vent like usual and bang on it. However, a Little Sister will not come out, causing the Big Daddy to groan in frustration and bang again before letting out a sad moan and walk away in an attempt to find another Little Sister.

Big Daddies will try to take care of anything they can if they do not have a Little Sister to take care of, even animals or other children.