If you don't threaten the Little Sisters, he's just a big teddy bear.
Each Big Daddy is sworn to protect a girl and will stop at nothing to keep her safe. Big Daddies have counterparts in the Little Sisters, young girls who harvest the stem cells from corpses. Still+looks+like+Bomberman,+doesn't+he? Who wouldn't want to have a go at wearing this fearsome outfit? Big Daddies are one of the enemy characters in BioShock, humans who have been transplanted into massive diving suits – complete with a heavy drill instead of a right arm (it's so much more useful), or a rivet gun, rocket launcher or ion laser.
