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Robert Downey Jr.
An industrialist, genius inventor, and consummate playboy; the CEO of Stark Industries; a chief weapons manufacturer for the U.S. military
Tony Stark/Iron Man
A friend of Stark's, and the liaison between Stark Industries and the United States Air Force in the department of acquisitions, specifically weapons development
Lt. Colonel James "Rhodey" Rhodes
Stark's business second-in-command, mentor and friend who turns on him to overtake the company, eventually building a giant exosuit to fight Stark
Stark's fellow captive, who grafts an electromagnet to Stark's chest "to keep the shrapnel shell shards that wounded him from reaching his heart and killing him", and who helps Stark build the first Iron Man suit
Stark's personal assistant and budding love interest