In [[BioShock 2]], the Big Sisters are post-pubescent [[Little Sister (bioshock)|]]s that have become unstable in Rapture's environment. Ten years after the events of [[bioshock (series)|BioShock]], they are charged with maintaining the ecological balance in Rapture. The Big Sisters' designs are geared towards accommodating Little Sisters; they have a cage-like basket that is adorned with ribbons, which is used to safely carry Little Sisters on their backs, and childish doodles can be seen on their oxygen tanks.
big sister