Deconstructing the idea of what a 'hero' is, what they do, what they look like, if heroism even really exists and how ideological 'noble' endeavors can do unintended harm, how do people deal with grief? What are the shades of it, the seasons. How can you look at the uncomfortable parts of yourself and accept them How different childhoods can radically alter a person's life
really takes a hard look at the fleetingness of happiness and how it's an evolving process shaped through the personal growth of the individual. How personal growth doesn't always have to be a positive thing, how you can love someone without really 'seeing' them and how that 'love' can blind you. How your peers can have a massive and oftentimes invisible impact on your perception, how sometimes to solve a problem you have to make more problems
Coming of age is a huge one. Not the teenaged coming of age but the adulthood coming of age. Being thrust into a world that's so much larger than you and how most of the time you're only a side character. More often than not you need to let someone else take the spotlight, be the hero, and that's not a weak choice. How being an adult and having power oftentimes doesn't actually fix anything
I'd say the biggest thing is it's not escapism fantasy. It's intended to be a deconstruction and reinterpretation of The Chronicles of Narnia and Harry potter
Depression and how that can find it's way into unexpected corners of a life
The subversion of a "hero's journey" and how that narrative is typically a masculine one that ultimately doesn't exist and clinging to it can be harmful. What does a 'heroin's journey' look like?