The Known Fate of Vox Machina

Vax'ildan
Vax is known to have perished and gone to serve the Raven Queen as her Champion after The Fall of Vecna.

Grog Strongjaw
Grog lived a full life, but didn't want to die a quiet death. Grog disappeared into the Cliffkeep Mountains in pursuit of a rumor that a great white wrym with two heads had taken up residence there. When Vox Machina had chased after him, they found a trail of monstrous bodies including several Frost Giants. But they never found the dragon or Grog's body, but the weather turned drastically for the better after his disappearance.

Taryon Darrington
Not much is known about Taryon's death, but it is believed he died (after a series of events) saving the world.

Percival (Percy) Fredrickstein Von Musel Klossowski de Rolo III
Percival de Rolo accomplished much in his life and bettered Whitestone greatly. He eventually died in his sleep, surrounded by his loved ones in Whitestone.

Vex'ahlia
Vex became the Guardian of Woven Stone after Percival and Cassandra de Rolo's deaths. She has been serving in this position ever since. She does currently have a consort that helps her with the day to day of governing Whitespires: Demeriax.

Keyleth
Keyleth has mostly remained in Zephra serving as Voice of the Tempest since Vax's death, unless some dire situation calls for her wisdom or aid.

Scanlan Shorthalt
Scanlan did end up finishing his book, In The Belly of Dragons: The Legend of Scanlan Shorthalt and Vox Machina. He is currently exploring the world and helping others with Pike Trickfoot, his wife, and Kaylie Shorthalt, his daughter.

Pike Trickfoot
Pike splits her time between roaming the world with Scanlan Shorthalt and leading the Sarenrae temple in Vasselheim. She is also considered the "Mom" of Vox Machina and is known for checking up on the various members most consistently.