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The Good King or The High Queen, generally. The examples demonstrate that Tropes Are Flexible and this applies to any benevolent autocrat, not just kings and queens.
The Philosopher King or Benevolent Mage Ruler if they are a philosopher or mage, and use that for helpful ends.
If they are especially benevolent and everyone realizes it, it could lead to Hundred Percent Adoration Rating.
May also be slightly related to Reasonable Authority Figure
"Come on! Let's get this show on the road."
A Ruler Protagonist also tends to be the Big Good. President Superhero and The Wise Prince usually don't fall under this trope but can be related.
Edited by Sirena
The ruler has 100% power, but it's presented as fine because they're well-intentioned