Hmmm, just having a thought. If Nikki has a power and she had an identical twin sister, would not her identical twin sister have a power too? Perhaps the power you get is not predetermined at birth, but your own experiences point it towards one of many possible powers. ie The cheerleader is in a fire as an infant so her power become self healing; Peter worships his older brother so his power becomes mimicry; Hiro daydreams of traveling to other dimensions all the time so his power becomes time travel; a similiar corelation might be found for every other hero.
Perhaps Nikkis twin sister developed the power to leave her body and control others in response to becoming fataly wounded and then entered her twin sister, where she slowly became evil and twisted from all the isolation because she does not know how to use her powers to the fullest and leave?
Edited, Mar 6th 2007 8:23pm by fhrugby