An extremely smart (though pretentious and socially awkward) friend of the family had cards made with the title of “Expert”.
Seconding Principal. This is frequently used by founders / equity holders in service businesses, and conveys a high level of experience and authority without being too pretentious (or too silly).
I suppose “God-Emperor” is right out.
(Now that the question has been answered…)
I have actually seen a business card from Mr. John Carter. It said, “Warlord of Mars.”
A friend of mine has cards that read “Friend of the Elves.”
Potential Lunch Winner.
(I miss you, Mitch Hedberg!)