Possible Clues:

• Crafty manipulator
• An evil genius, heartless, perhaps?
• Complete controller
• Start to suggest leaving out sinister controller
• Angel is v. perverse, becoming a bad character
• Showman at first leaving out sinister hypnotist
• Hypnotist literally leaving sections under spell, from the onset
• When Vangelis composed, he was hypnotically in control
• Sinister controller (of another person)
• Trilby's mesmerist