Curate, connect, and discover
Barbatos' envoys. Lookalikes, appearing every now and then, meant to help the people when the archon couldn't. Reintroducing old songs to remind them of any forgotten pasts, and crafting new songs to tell them of the future. They often take it upon themselves to also keep people from putting words into barbatos' mouth, and debunking any false information. Just like any citizen, an envoy is free to do as they please. It would be weird to chain down a symbol of freedom with unnecessary duties if they do not wish to do it. They may look human, but so does barbatos. The people have decided envoys are basically spirits. No one has ever seen an envoy look younger or older. No one has ever seen one be born or die. They simply appear and disappear with the wind.
The origin of this is that people long ago (before cannon/ in-game time) noticed that venti is practically identical to barbatos. Rumors started to spread, and to keep people from guessing his true identity, Venti came up with the envoy idea. He didn't want to make the people feel stifled by the presence of their archon, to walk on eggshells around him and offer their first born when he trips.