I'm caught up on all the episodes and now I have to say that my favorites are Greg, Rose, Sadie, Garnet, and Steven. I like how Steven cares about everyone and seems to have a strong and immediate bond with everyone in the city, that makes for a great character.
And I really liked the episode with the videotape of Rose and Greg. It reminded me of that episode of Cowboy Bebop where Faye sent herself a cheerleading video for her future self - also how Rose talks about every living thing being a unique experience. I've always been against killing even insects crawling across the sidewalk because even if they seem insignificant to us humans and probably don't have a complex consciousness, the fact that each life has a unique sensory experience is what makes every living thing important to me.