Daenerys Targaryen + book quotes and statements by GRRM that show that she has all the characteristics that (according to her creator) define a good king (in/s/p.)
GRRM at the “House of the Dragon” Comic-Con panel: A good king is someone who regards being king as a duty rather than a privilege that they are entitled to. A duty to the realm to dispense justice and peace, and occasionally do boring things like building roads and sanitation in King’s Landing and all that.
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GRRM on which of his characters would be suitable leaders in modern times: You know, probably Tyrion. [...] Dany would also be an interesting choice if we could bring her dragons along. The recent American election [of 2016] might have turned out very different if Hillary Clinton had dragons. [as the linked meta above shows, GRRM's decision to mention Dany - especially when he could have chosen to name so many other characters - alongside Tyrion (who he deems the most suitable leader) highlights her portrayal as a good ruler and acknowledges that, with the right person, dragons can be used for good.]
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GRRM to History of Westeros: I mean, it’s… you know, I had a lot of input in the beginning of Game of Thrones, partly cause I had these books out there. Um, but at a certain point, as the show went on, I, I found I had less and less influence uh, until by the end, I really didn’t even know what, what was going on. I, I… Some of these things I watched like everybody else, and ‘oh, okay.'
