John is my favorite character in all this. His development here is the same as in the non-canon snaps, and I like how he's portrayed coming to terms with his own depression and his alienation of his friends.
Jane is way too on-the-nose as a Trump stand-in, but we see enough of her outside of just being a one-dimensional Trump metaphor that I don't mind it that much. While she... was barely an actual character in the webcomic proper, her relationship with the Condesce at least gives some reasoning for this choice of characterization.
More details on the specific nature of Dave and Karkat's relationship was good. I never really hated the pairing, just the stupid hamfisted way it was introduced with pretty much no setup, but this sheds some more light on the situation.
Jade being a sex-addicted slut is kinda funny, and could logically follow from what little characterization she has in the webcomic proper (little human contact and poor social skills, bubbly exterior hiding deeper emotional turmoil).
Dirk has always been a controlling, scheming asshole, that's literally 95% of his characterization, not sure why people are surprised this is being taken up to 11 after he literally gains omniscience.
I honestly don't even mind Roxy being non-binary. She's been living with a genderless green skeleton for the last 5-6 years, and in her life before she's literally a hermit living among chess people so it's not like she has a good reference for what gender norms even are. If Hussie HAD to hamfist a non-binary human character she's like the only sensible choice.