Norman Osborn, also known as the Green Goblin, is a major antagonist in 'Spider-Man: No Way Home.' A brilliant scientist and wealthy industrialist, he becomes the Green Goblin after exposure to an experimental serum that enhances his abilities but drives him insane. In the film, he is transported to the Marvel Cinematic Universe and plays a pivotal role as one of the villains fighting against Spider-Man and his allies, showcasing a complex and dangerous personality.