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
Good articles, and particularly the last one in illuminating one of the reasons Rian chose to portray Luke wielding his blue lightsaber in the confrontation instead of his green one.