Crowley is the king of hell, strongest demon alive. Hints named king of hell, he's not scared of anything expect Lucifer. Crowley's mother, Rowena is a witch and a damn strong one.

Crowley sometimes helps dean and Sam Winchester, but not much. Dean and same Winchester have a sister, Dean's twin sister and she's scarier then anything anyones seen before. Her name is Jax, she's basically raised dean and sam.

Crowley loves Jax, but dean and Sam never let anything happen between them.