In his first appearances, the Green Goblin seems to be a normal man (albeit very nimble and athletic) who gets his powers from his many gadgets. In later appearances, it is established that due to the "Goblin Formula", Norman and any successor to the Goblin persona possesses superhuman strength (lifting 9 tons under optimal conditions), increased speed, reflexes, endurance, and healing rate. Though much slower than the likes of Wolverine, he can regenerate damaged tissue and organs. His intelligence has been enhanced to gifted levels, though at the price of his sanity. His involvement with the Gathering of the Five loosened his grip on reality, though he is able to maintain his sanity via chemically treated dermal patches. When not impaired by mental illness, Osborn is a cunning businessman, masterful strategist, and highly skilled in electronics, mechanics, engineering and chemistry. The Green Goblin is armed with a variety of bizarre devices. He travels on his bat-shaped "Goblin Glider", an incredibly fast and maneuverable rocket glider equipped with various armaments. Other weapons the Goblin uses include incendiary Pumpkin Bombs, smoke- and gas-emitting grenades resembling ghosts and jack-'o'-lanterns, razor-edged boomerang-like throwing weapons called razor bats and gloves woven with micro-circuited filaments which channel pulsed discharges of electricity at nearly 10,000 volts. He wears a green costume underneath bulletproof chainmail with an overlapping purple tunic. His mask has a built-in gas filter to keep him safe from his own gasses.

According to Steve Ditko: "Stan's synopsis for the Green Goblin had a movie crew, on location, finding an Egyptian-like sarcophagus. Inside was an ancient, mythological demon, the Green Goblin. He naturally came to life. On my own, I changed Stan's mythological demon into a human villain."

The Green Goblin debuted in The Amazing Spider-Man #14. At this time his identity was unknown, but he proved popular and reappeared in later issues, which made a point of his secret identity. Apparently, Lee and Ditko disagreed on who he should be. According to one theory, Lee always wanted him to be someone Peter Parker knew, while Ditko wanted him to be a stranger, feeling this was closer to real life. However, Ditko recounted: "So I had to have some definite ideas: who he was, his profession and how he fit into the Spider-Man story world. I was even going to use an earlier, planted character associated with J. Jonah Jameson: he [was to] be [revealed as] the Green Goblin. It was like a subplot working its way until it was ready to play an active role."

Ditko left the series with issue #38, before he could reveal the Goblin's identity, and Lee unmasked him in the next issue as Norman Osborn, a character who had been introduced two issues earlier as the father of Harry Osborn. John Romita, Sr., who replaced Ditko as the title's artist, recalled: "Stan wouldn't have been able to stand it if Ditko did the story and didn't reveal that the Green Goblin was Norman Osborn. I didn't know there was any doubt about Osborn being the Goblin. I didn't know that Ditko had just been setting Osborn up as a straw dog. I just accepted the fact that it was going to be Norman Osborn when we plotted it. I had been following the last couple of issues and didn't think there was really much mystery about it. Looking back, I doubt the Goblin's identity would have been revealed in Amazing #39 if Ditko had stayed on."

In the landmark story "The Night Gwen Stacy Died" (The Amazing Spider-Man #121-122), the Green Goblin kills Gwen Stacy and later perishes in a fight against Spider-Man. Others, such as Harry Osborn, later adopted the Green Goblin identity, and writer Roger Stern later introduced the Hobgoblin to replace the Green Goblin as Spider-Man's archenemy. In addition, a retcon during the "Clone Saga" determined that the original Green Goblin survived the events of The Amazing Spider-Man #122 and had been playing a behind-the-scenes role in Spider-Man's adventures since then.

Stephen J. "Steve" Ditko (born November 2, 1927) is an American comic book artist and writer best known as the artist and co-creator, with Stan Lee, of the Marvel Comics heroes Spider-Man and Doctor Strange.

Ditko studied under Batman artist Jerry Robinson at the Cartoonist and Illustrators School in New York City. He began his professional career in 1953, working in the studio of Joe Simon and Jack Kirby, beginning as an inker and coming under the influence of artist Mort Meskin. During this time, he then began his long association with Charlton Comics, where he did work in the genres of science fiction, horror, and mystery. He also co-created the superhero Captain Atom in 1960.

During the 1950s, Ditko also drew for Atlas Comics, a forerunner of Marvel Comics. He went on to contribute much significant work to Marvel, including co-creating Spider-Man, who would become the company's flagship character. Additionally, he co-created the supernatural hero Doctor Strange and made important contributions to the Hulk and Iron Man. In 1966, after being the exclusive artist on The Amazing Spider-Man and the "Doctor Strange" feature in Strange Tales, Ditko left Marvel for reasons never specified.

Ditko continued to work for Charlton and also DC Comics, making major contributions, including a revamp of the long-running character Blue Beetle, and creating or co-creating the Question, the Creeper, Shade, the Changing Man, and Hawk and Dove. Ditko also began contributing to small independent publishers, where he created Mr. A, a hero reflecting the influence of Ayn Rand's philosophy of Objectivism. Since the 1960s, Ditko has declined most interviews, stating that it is his work he offers readers, and not his personality.

Lee and Ditko's collaboration on the series saw the creation of many of the character's best known antagonists including Doctor Octopus in issue #3 (July 1963); the Sandman in #4 (Sept. 1963); the Lizard in #6 (Nov. 1963); Electro in #9 (March 1964); and the Green Goblin in #14 (July 1964). Ditko eventually demanded credit for the plotting he was contributing under the Marvel Method. Lee concurred, and starting with #25 (June 1965), Ditko received plot credit for the stories.