I'm sorry to be so vague with this (new relationship)
My boyfriend (27 male) seems more bubbly on the outside but likes darker thoughtful books. Many of the ones I would choose are older books and I want to find something he hasn't read.
Something with great visual and good moral dilemmas I think would fit him well. I'm sorry I don't have reference books.
For extra reference one of his favorite mangas right now is gachiakuta
by Katinatree