One of the best trilogies I've ever read. The writing style won't click for everyone, and you have to commit to the full trilogy - books one and two pose more questions then they answer. That being said, the characters, world building, and foreshadowing of twists are all incredible and this is a series that you should absolutely buy and read asap. I'll be re-reading it again sooner rather than later.
Two items that really stood out to me -
There was an ongoing theme of people harming others "for their own good". Parents hurting children, authority figures hurting their charges, all in the name of strengthening them or making them understand that “this is how the world works”. This is something we see in real life more than we should, where everyone will acknowledge that society is failing in some key way but won't make an effort to change, or will even actively enforce it because 'this is how it is'. Watching not just one but multiple characters slowly realizing that they didn't have to follow this pattern was wonderful. Three cheers for self-improvement and breaking cycles of abuse/ generational trauma!
Diversity and representation - No individual character's gender identity or sexual orientation matters to the plot. Instead we just get a rich cast of characters both major and minor with some of the broadest representation I've seen. Straight, bi, gay, cis, nonbinary, trans, able-bodied and disabled, I loved it. It makes the world feel so much more real to show the full range of the human experience rather than just focusing on one thin slice.