Minor spoilers for Sandrone's tea party stuff for Wanderer--
Oh my god!!! He was so happy she was alive!! He sounded so happy??? At least in the Japanese dub!
I also loved and adored the parallels and contrast they showed of them being creations/puppets. Wanderer being cast aside by his mother, Sandrone being raised by her father with love and care--Wanderer being constantly dehumanized, Sandrone being validated during the formative years of her life...
Wanderer talked about how he has a much longer way to go to make up for his past transgressions, and I think he's really not looking at himself properly. In that he's so focused still on his sins that he hasn't really seen his own growth.
Like Wanderer, sweetie, do you think your old self would have been so delighted to see Sandrone was still alive? Where that delight came from the (hidden) grief of losing her in the first place? Do you see how gentle and warm your 'heart' has become? Do you see how much love you fill it with?
Do you see how you've already grown?
I hope we get to see a Wanderer who doesn't constantly chain himself down for his past, especially over stuff Dottore had done.