Who is the tall guy with the mustache in sonic?

The tall guy with the mustache in the Sonic franchise is Dr. Ivo Robotnik, commonly known as Dr. Eggman. He is the main antagonist of the series and is known for his genius-level intellect, mechanical prowess, and his desire to conquer the world using his robots. His character is often depicted as a comical yet formidable foe to Sonic the Hedgehog.