The truth of the matter is, all of those guys on Star Trek: The Next Generation actually want to be me. These impersonations they do are just some way of trying to feel what it must be like to be me. And I understand that! Because it feels really good to be Patrick Stewart!
I made a promise to myself that I would try to introduce something unexpected in every single episode of the series. It was largely to amuse myself as much as anything. I didn't ever want the audience to feel that they knew everything.
What identifies an individual as a king is how other people behave towards him. All authority is assumed, and if other people don't accept your authority then you don't have it. Perhaps the critical thing to being a convincing figure of authority is actually not to try too hard.