Adelaide has been one of the more intriguing characters on 'American Horror Story' (Wed., 10PM ET on FX). It appears that most of the people the Harmons encounter in the house are ghosts, but Addy was always very real. And yet she was in the house almost constantly.
She's been connected with it dating back to the 1970s when she was a child, but the spirits don't seem to wish her any harm. Of course, they don't seem to mess with her mother, Constance, either but that could be because Constance may well be scarier than any of them.