Kent Nelson is known as Doctor Fate. Is he really a medical doctor like Dr. Strange or does he hold another PhD title?
While "Doctor Fate" as a role that is passed down to various people is not necessarily a medical doctor in all of his incarnations, Kent Nelson, the first (published) Doctor Fate, was a physician in his original appearances in More Fun Comics, as you can see here:
A holdup! And I think I recognize an old enemy! Looks like Dr. Fate will have to write a prescription with a punch!
Harley Quinn certainly didn't think so for one of them:
Wow, that’s some positive talk in front of the patient. Don’t worry, random little girl. I’ve never lost a monkey before and I’m not about to start today! And you! You can’t just put on a helmet and a cape and call yourself doctor. Some of us went to medical school and earned our title. Now, please take this small girl out of my operating room, Mister Fate.