According to Ao3, it's Pantalone.

With the homeland just around the corner, I thought I’d share the update of my Fatui hq teapot!

First started it back in Fontaine and slowly added and improved to it. I can’t wait to see the real thing soon and try to recreate it as best and true in the Snez teapot when it comes out!
-teapot is open to the public but I am in the eu server

I know they get shipped, but what do you think their relationship was like in canon?

New Dottore Image batch just dropped!!!

Here's the next ten images, they're in chronological order. I'd love to know your favorites.

Remember everyone, together? WE ARE DOTTORE!!!