Sorry. I had to point this out. There are sooo many big daddies. Way more than three. There's the standard bouncer, standard Rosie, then there's the elite versions of those two from the first bioshock, then in bioshock two, there's the protype big daddy called Subject Delta, there's the Alpha series which are super spliced up, radiating various plasmids from their bodies, then there are the rumblers. And if you want to count this one, the Big sisters. So that makes 8, with the Big Sis included. Sorry. I'm like Ocd about these things. Anyways, Subject Delta, the alpha series, and the Big sister are my personal favorite guardians of the sisters.