Very good interpretation of Gwen and her growth over the seasons. The (relative) cheerfulness towards the end of part IV felt a bit off for me, given how grim everybody looked in the episode itself, but apart from that, a lot of it feel so right.

I love the lines "There will be a future. She just has to figure out a way to live in it."
and
"She makes herself speak her father’s name, and it feels like hammering a sword into shape."
Tom wasn't around enough for me to really start to like him for himself, but I think his death is the defining event in Gwen's life so far.

(About Arthur/Gwen, I cannot make up my mind if I think "they're terribly cute and I love how they have this ongoing conversation about good rulership and are building a partnership without knowing it" or "they're terribly cute but the difference in status and power between them freaks me out and I don't trust the show to resolve it in a satisfying way.)