Bioshock 2!

[Jikanu]

that'd make sense... but it says on wikipedia:

"This single attacker, who is the Big Sister, one of the Little Sisters from the first entry in the series,[4] has mechanised herself in a similar fashion to the Big Daddies — and has become the ruler of the underwater city of Rapture, which under her control has reached an equilibrium in which she "actively maintains the city's infrastructure, and viciously hunts anyone down who disrupts the balance of power"

Wouldnt the equilibrium mentioned suggest that she keeps adam levels balanced too?

EDIT: on wikipedia, it also says that you're a rogue big daddy... perhaps your character staged a rebellion? o.o

DOUBLE EDIT: also, it specifically calls you the prototype... perhaps this will have some significance on how you think? i mean, they could choose for you to be any big daddy, why specifically the first?