Harkos is a gargoyle demon, who is one of the Sindren created by the Matrons in my RP. They're the result of experimentation by people to try to make an army- and so they grow to adulthood about 3-4x faster than usual, but mentally stay the same.

As such, you can have a four year old who looks like they're 16. And a 6 year old (like in this picture) who looks as if they should be an 18 year old adult. But still thinks, and acts (and has the knowledge) of a child in an adult's body.

Every Sindren has scales across heir body as a sign of the experiments- and in this case Harkos (unfortunately) has his across half his face, making him rather self conscious)