That's a glorious way of looking at it and I do strongly agree. It really shows us how complex everyone is and how the narrative changes whether a person is a bad guy or a good guy. Or, you know, just a guy.

Both Hak and Yona are AMAZING. I need me a Hak, tho, because that man is gorgeous and loyal and strong and patient and mkajrmkajmaja. But yes. Amazing characters. Same with the dragons, whereas you said - it's impossible to truly pick a favorite because each is so amazing. Tho I also agree that Kija is my least favorite.
Zeno is most tragic, in my opinion. Just. My heart bleeds for him. For all of them, of course, but Zeno being unable to do much except to continue on and exist just breaks my heart when I think about it for too long. It feels like the cruelest punishment.