John lives in Maple Valley, Washington
Dave lives in Houston, Texas
And Jade lives on a non-specified Pacific Island

No

In the retconned timeline: All the prescratch trolls, Tavros, Eridan, Feferi, Equius, and Nepeta.  

Original Vriska is most likely still in the dreambubble.  Hussie recent gave her a drastic makeover most likely to make it possible to distinguish the two Vriskas from each other.

Aradia isn’t dead so she can leave the dreambubbles if she wanted.  The dead ghost people and trolls cannot leave though.

They develop them as they play through the game as seen with Terezi using Mind powers despite not being God Tier.

She lives in a secluded mansion in Rainbow Falls, New York.  I do not have a credible source for this though so feel free to reblog with one if anyone has one.

GAME OVER: Everyone dies and John beats up Caliborn.

Terezi and Roxy survive, John shows up, Roxy goes to see her denizen, John goes to see his denizen and teleports his planet. then he goes back to before he left Terezi, Terezi gives him a list of stuff to change then dies.  John goes back and changes a bunch of stuff.  Now Vriska is alive, the Condesce is confused, Team Good Guys is winning, Retcon timeline John and Roxy are dead, Aranea never came back to life.  John teleported him, his planet, and original timeline Roxy back to the session.

That’s a rough summary.

Diamond Droog was her exile and convinced her to kill Vriska.

Gamzee is probably no longer dead and Aradia is not dead, she just prefers to live in the dreambubbles.