Mefistofele is a character in a famous Italian opera. He is the main villain and is a demon who works with the devil. He tricks people into making bad choices and then punishes them for it. He is often seen as a scary figure with horns and a long, red cape. Mefistofele represents the temptation to do bad things and the consequences of following them. He is a warning for people to stay away from wickedness and do good for others.