The Vision is an android built by one of the Avengers greatest enemies, Ultron. The Vision later defeated Ultron's programming and eventually became an Avenger himself. Not long after joining, he married one of his female teammates. That's right: A robot married a human. That's fucking progressive, Marvel Comics.
Evidently the Vision has multiple color schemes, which I noticed when I told my wife that she colored him incorrectly and she showed me a reference photo that she found online. After arguing for 175 years, I switched the colors around real quick and we moved on without divorcing each other.