Svengali
Etymology
From the sinister hypnotist Svengali in George du Maurier’s 1894 novel "Trilby," who mesmerizes the tone-deaf model Trilby into a great singer entirely under his control. The character’s name became the word for a manipulative mentor or handler. It carries a whiff of the malign and the hypnotic that "mentor" lacks.
noun · /sven-GAH-lee/
A person who manipulates and dominates another, often to exploit their talent.
What it names
For the controlling puppet-master behind a protégé — the hidden hand shaping someone else’s success.
Example
Reporters cast the campaign strategist as the candidate’s Svengali.
Related idea
A mentor guides for your benefit; a Svengali controls for his own — the same relationship of influence, but generous versus exploitative.
See also