In Iron Man fanfiction, the 'Merchant of Death' could refer to Tony Stark's former identity. Before he became a hero, Stark was known for manufacturing weapons, which earned him this dark title. His company supplied arms to various parties, and this part of his past often plays a significant role in fanfiction, sometimes as a source of inner conflict for the character as he tries to atone for his past actions.
The movie's portrayal of Iron Man's death doesn't strictly follow the comic. In the comic, the circumstances and details might vary. However, both are designed to have a significant impact on the storyline and the fans.
Writers should consider the impact on other characters. If Mary Jane witnesses Spider - Man's death, describe her heartbreak in detail. Maybe she falls to her knees, sobbing uncontrollably. The setting can also add to the memorability. A dark alleyway during a rainstorm, with lightning flashing as Spider - Man takes his last breath, can create a very dramatic scene.
There are many speculations about the man in the iron mask. One theory is that he was an illegitimate son of Louis XIV. He was locked away with an iron mask to hide his identity so as not to cause a scandal or a threat to the king's power. Another view is that he was involved in some sort of political intrigue at the court. However, the exact truth remains uncertain and has been the subject of much debate among historians.
In the story, the man in the iron mask was a mysterious prisoner. His identity was kept secret, and he was forced to wear an iron mask all the time to conceal his face.
Iron Man's origin in the comics involves Tony Stark getting captured and using his engineering skills to create the first Iron Man suit to escape. After that, he continued to improve and develop the technology to become the hero we know.