I recall Trevor being a lot like Lois Lane - there to come back to for romance interludes in between superhero business, sometimes joining in on an adventure, and always available for villains to capture and hold hostage for a few pages. Not that I read all that many comics in my youth.

Oh yeah... if Etta's mortal and in 1918, and we've already seen Diana a hundred years later, she's unlikely to get any further role :(