I haven't read all of the books on this list, but I did find this crowd-sourced list of "clean" books with limited violence for someone looking for high school literature selections.

https://www.goodreads.com/topic/show/531214-high-school-booklist-substitutions

And Progeny Press publishes literature study guides for Christian homeschoolers, which I would suspect would slant their selections toward less graphic novels--although that won't necessarily insulate you from complex themes. Also, you may or may not wish to use their curriculum if it doesn't align with your faith traditions. (Although I've skimmed through some of them, I have not actually used any of their guides myself.) Even if you don't use their literature guides, the book lists may still be worth consideration.

https://stores.progenypress.com/

...pronounced like the long vowel and first letter of the alphabet...