Humble royalty, hm? There are a few good stories like that. I’ll put links down below because hyperlinking on mobile is a paaaaiiin, but a few that come to mind from the start would be the Beast from Beauty and the Beast or either the frog or the princess from The Frog Prince, or any similarly cursed prince or king, either the prince or the wild man from Iron Hans, the princess from King Thrushbeard, Cap o’ Rushes (and it has a LOT of sister stories so you can play with Emi’s changed appearance a lot), the prince from the Frog Princess (different story from The Frog Prince).

There also quite a few non-royal stories involving lessons in hard work, humility, and politeness, like Mother Holle and Diamonds and Toads, often with one kind and hardworking sibling and one rude and lazy sibling so Emi could go into either role. There’s also Bearskin, where a soldier is cursed by the devil for being cocky and has to survive seven years by being kind and virtuous. And if you wanna play with his Reaper side more, there’s Godfather Death, where a baby is given Death as a godfather and grows up to be a doctor with Death’s help and... also features a humbling lesson of a sort~


http://surlalunefairytales.com/beautybeast/index.html
http://www.surlalunefairytales.com/frogking/index.html
https://www.pitt.edu/~dash/grimm136.html
http://www.surlalunefairytales.com/kingthrushbeard/index.html
http://www.surlalunefairytales.com/donkeyskin/stories/caporushes.html and http://www.surlalunefairytales.com/donkeyskin/other.html for the sister stories, but Cap o’ Rushes has the less squicky reason she ran away from home
https://en.m.wikipedia.org/wiki/The_Frog_Princess
https://en.wikipedia.org/wiki/Diamonds_and_Toads
https://en.wikipedia.org/wiki/Frau_Holle
http://www.surlalunefairytales.com/bearskin/index.html
http://www.surlalunefairytales.com/godfatherdeath/index.html