Ghost was a corporate saboteur with the ability to become intangible and invisible by way of his suit. He's also an incredible computer hacker.
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History
FIRST APPEARANCE: Iron Man #219 (March, 1987)
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The man who would be known as The Ghost was once a promising data engineer for a major computer corporation, and the brainchild behind GhostTech, a series of computer chips that phased into an intangible state before overheating, yet could still function in this state and hold an incredible amount of data. The prized employee of this company, its executives used his genius to make themselves exceptionally wealthy, spurring his continued productivity with everything from sports tickets to sexual favors from another employee.
When the GhostTech project was finally completed, they had his lover killed after she threatened to reveal how the company made her into a call girl for their benefit, causing him to slide into a deep depression. As a result, he infused his body with GhostTech and formed a cybernetic connection with the company's systems. Through this, he discovered his girlfriend had been murdered. Surviving an assassination attempt thanks to the GhostTech in his body, he dispatched the company executives one by one, before eliminating any link to his past life and becoming a full-time corporate saboteur. It should be noted that this origin may be inaccurate, given that Ghost was telling it to the untrustworthy Moonstone, and that his prolonged existence within an intangible state has negatively affected his psyche.