Originally Posted by
J. D. Guy
People do ship them, though in a "Two most prominent characters of 'X'" kind of way. In this case, Zatanna and Constantine are the two most prominent male and female (known orientation-compatible) magic users of DC. At least as far as a number of people are concerned. You see similar phenomena when it comes paring up known orientation-compatible LGBT+ characters (in and outside of DC), or when asked to pair up Black characters, how it boils down to "John Stewart and Vixen" mostly due them being the only two Black DC superheroes a lot of people bother to know about. Whether they are compatible in other ways that would make exploring them as a couple make sense and be worth the effort rarely ever gets examined.
That's where the whole thing came from in the first place where some people feel Zatanna is often functionally just there to be someone relevantly recognizable enough to be seen alongside, and therefor "prop up", Constantine.