The Iron Man is the unlikely protagonist of the story and a dynamic character whose position within society shifts over time as more facets of his personality are revealed. The Iron Man is initially presented as a mysterious entity with no known origin, maker, or purpose. He stands atop the cliff amid an atmosphere of foreboding and intrigue as his red glowing eyes scan the sea below. The Iron Man seems to be drawn to the sea, but because his intentions are not known, both the author and the reader are left to guess why he continuously returns there. The Iron Man is presented in direct contrast with the natural environment but is himself part of it and at least partially alive; these connections illustrate The Relationship Between the Natural and the Mechanical.

The Iron Man’s parts all work in unison and can communicate with one another, which allows him to put himself back together if he breaks. He is apparently indestructible and consumes only metals, which his body responds to depending on their quality. Old, rusty metals make the Iron Man unhealthy, while rarer, more precious metals give his body a healthy glow and sheen.