I definitely like Oliver a lot more when we get to see his child self and backstory. Like I said in my review for volume 4, I'm not the biggest fan of the "mysterious angsty boy is Lost and Broken and needs the love of the main character to Fix Him" trope here, but Oliver feels more like an actual character to me when I get to see his child self, and it's much easier for me to like and care about him.
I will say though... Little bit gobsmacked at the "behind the scenes" comic at the end of the omnibus 3 (where I reread this volume this time) where the author goes through his process and how the idea for this comic developed (really interesting, and honestly encouraging for my own writing to see how long he took) and he straight-up says that that aspect of the story that I don't like was inspired by Twilight, which I had already been mentally comparing the trope to but didn't want to voice out loud because it felt too mean xD He says he didn't particularly like the book, but he "did see the appeal of the story. The dark, mysterious, tortured man... The girl who is brave enough to approach him... The bond that inexplicably forms between them... It is an archetypal story as old as Beauty and the Beast."
So yeah, I do feel like he handles the trope /better/ than Twilight, and I do like Oliver better than Edward (especially, as I said, once we get to see more of his backstory), but still, kind of wild that I saw those connections and then the author straight-up confirmed them