Premanand Maharaj Ji
Why is Ravan called a demon despite being born in a noble family?
Ravan lost character despite an excellent family
Ravan came from an excellent family but, having lost character, was called a demon. One who loses character is called a demon.
Ram appeared in the Raghu dynasty, and Ravan was of an excellent line, a Brahmin of Pulastya's family, yet having lost character he was called a demon.