Steve Trevor is the rarest superhero love interests. First, he’s a man. Second, he’s an ordinary man with no powers. Third, as the first man Diana ever meets, he’s integral to her origin.
But, last and most important, Steve sets the template for Wonder Woman’s view of the “man’s world” outside Paradise Island.
For those familiar with the story, young Princess Diana is raised by the Amazons of Paradise Island until the day when a World War II pilot crashlands during a secret mission. When Diana rescues him, he considers her his “angel” and thus a great romance is born. That was the basis of the Wonder Woman television show of the 1970s, though it’s Steve Trevor Jr. in the later episodes set in the present day.