For the record, I have always admired the Royal Family, for being....Royal.
I believe that the planet needs a Royal Entity.
However, while the current Royal Family is an entity based on style with little or no substance, a true monarch (for the entire planet), preferrably male, would be the ultimate combination of style and substance.
He, by default, would be granted a physicality that, to say the least, presents an image of strength. He would be in the best shape he is able to be in, in terms of muscularity (beefy), flexibility (bendy), and cardiovascular (breathy?

) fitness, be at least 6 feet tall, if not exactly 6 feet tall, and weigh at least 200 pounds, if not exactly 200 pounds, so as to be classified as a 'heavyweight', literally and figuratively.
Indeed, his physicality would be topped off with a full head of hair that is deep dark brown, and have facial features that may be considered "handsome" by either the trained or un-trained eye. His facial skin would be the envy of many females; smooth, glowing, and flawless. His face would be accented with a smile filled with only real teeth that are straight, bright, and reminiscient of QEII's smile. He is always clean-shaven.
His body, however, is merely a package for the product; substance, and that is where the rubber hits the road.
His mental capacity would be greater than what could be considered "average"; he is, what is known as, "smart".
His emotions are always in check, because he understands that what was "out" there, does not affect what is "in" here.
His spirituality capacity is the icing on the cake. Indeed, it is his spirit, the icing, that holds together the cake, his body and all that it contains, including his soul.
His personality has been fired in the oven for a long period of time; he has been 'cooking', tested by many obstacles that only he could survive, so as to prepare him for his true purpose: claim his rightful place on the Throne, and Rule.
He would find joy in ALL children, and many but not all adult individuals. He would find joy in ALL animals, except mosquitoes that are "annoying", and ALL mosquitoes are an annoyance. He is not fond of talking, and is always polite to individuals that intend to be polite.
As for individuals that intend to not be polite, he understands that only those individuals will not be permitted into his universal kingdom, and hence, only a temporary annoyance.
That is my idea of a Royal Entity/King.