Imps

Biography
Imps are creatures that can disguise themselves by other people, based on what they see. There are I beleive (plz forgive me if I am wrong) 2 types of Imps. Ones which the Demon Warlock controls and they are faithfully loyal to him, or Imps that the Demon Warlock created, but ended up having a mind of their own and wanting to live normal human lives. They usually disguised as children. If the person they turn into is wearing a hood or such, for example Aaron, they would only be able to copy what they saw, so if the "person" had to take of their hood, they would probably look completly different.

Appearance
Imps are a reddish color, small with white horns and wings.

Personalitys?
Imps are usually very loyal to the Demon Warlock, but some had a mind of their own and wanted to live normal human lives. So if you see the same person twice on the island, it could be an Imp or the real person. Imps tend to have extremly bad social skills, so it would be really weird to try to talk to them.