Green Goblin is Spider-Man’s nemesis, and the alter ego of businessman Norman Osborn. Green Goblin shares many characteristics with the devil. For instance, high on a building, which is above the city (both literally and metaphorically ), he tempts Spider-Man to join forces with him to rule the world.
Also, he attacks Aunt May while she is praying, and afterwards Aunt May recounts the traumatic episode, emphasizing Goblin’s terrible yellow eyes and calling him the devil.
The color green is associated with envious feelings, sickness, and also in the Middle Ages green was commonly associated with evil beings such as dragons.