Two great takes on Luke Skywalker here:
https://www.zacbertschy.com/blog/2017/12/29/my-hero-luke-skywalker
https://www.tor.com/2018/01/04/luke-skywalker-isnt-supposed-to-be-nice/
and a cool article on the score:
https://www.newyorker.com/culture/culture-desk/a-field-guide-to-the-musical-leitmotifs-of-star-wars