Svengali is a term used to describe a person who has a strong and manipulative influence over someone else. Some common synonyms for this word include puppeteer, manipulator, controller, or mastermind. Other words that can also be used to describe a Svengali-like person include dictator, despot, tyrant, or autocrat. These words typically reference someone who uses their persuasive powers to control others, often without their knowledge or consent. In some cases, these individuals may use their influence to shape the opinions, behaviors, and actions of their followers, often for their own gain. Regardless of the term used, a Svengali-like person has both a powerful and dangerous influence over those around them.