The devil has
angels and these devils are fallen angels who have
gone against God. They have joined the devil and
became evil beings.
Act 19:16 Then the man in whom the evil spirit was leaped on them, overpowered them, and prevailed against them, so that they fled out of that house naked and wounded.
There are also the evil sons of God who have turned against God. They are called beasts.
of them, a prophet of their own, said, "Cretans are
always liars, evil beasts, lazy gluttons."