Ok, since not much is known about them, and there are only two playable right now, it is JUST Tar Tar and Wanderer. Since these two are the only ones the Teyvat gang know(also because they spy for them).
Ajax! Or Tartaglia.
He is a "normal" member, outside he lives with his hubby Zhongli, and works in a toy shop.
Wanderer(Or Muffin, which is what mine was named)! Or Scaramouche.
He is a "normal" member, outside he just goes to high school with everyone else. He is also apart of 6wirl.