Subject Echo is an Alpha Series Big Daddy who greatly resembles a Bouncer. He has yet to appear in a story.
SubjectEecho is larger than average Bouncers. His drill is not welded onto his hand, but is mounted on his arm and can extend over his hand. He is shown to be more intelligent and thinking than normal Big Daddies. He has been shown to be able to control, and willfully use Plasmids. Despite his differances from normal Big Daddies, he is still never seen fighting other Big Daddies or Big Sisters, or attacking sane citizens of Rapture.
He is considerably more docile than other Big Daddies, and can be approached by other citizens without attacking, though in battle he is relentless, and will hunt attackers down should they retreat.