Not what she seems

Imagine your walking through Amaro( )'s castle, and you spot Cazzy. She seems to be enjoying herself. Until you notice her shadow. There was a normal shadow, then the shadow of a tall creature with a sinister smile. You wonder how that thing git past Amaro without him knowing. Then it hit you. This thing was literally attached to Cazzy's soul, hence the empty heart spot on its chest. Which means wherever Cazzy goes, her presence will only be one instead of two.

The spirit's name is Chaos, and no, he is not just an evil version of Shadow.