Dooku, also known as Count Dooku, is a fictional character in the Star Wars universe. He is a former Jedi Master who becomes a Sith Lord, taking the name Darth Tyranus. Dooku plays a significant role in the Clone Wars, leading the Separatist movement against the Galactic Republic. As a skilled lightsaber duelist and powerful Force user, Dooku is known for his charisma and intelligence. He was once the mentor of Obi-Wan Kenobi and later trains Anakin Skywalker. Dooku's complex character explores themes of power, betrayal, and the struggle between light and dark.