All these Kings are dedicated to their people, but Black Panther has a deep love for them all that goes further than the others, in my opinion. I mean he basically exiled and got a divorce with Storm because she wasn't as dedicated to the people of Wakanda as he was by not giving wakanda the care and attention it needed. And not making the safety of wakanda her top priority.
Also, Dr. Doom DEFINITELY deserves to be on this list. He'll be my #2 right behind BP.