He talks on his own and even has a distinct personality! But I imagine it must still be pretty rare. The only other one I can think of is a certain Hydro user who can summon a whale made entirely of water.

[Which he also throws at people because Childe has no chill.]

[But okay, cooing at Ushi aside, he does need to finish up here. And as they chat, he finishes up the other arm and starts on the wounds around his torso.... ignore the little blush as he moves the cloth over his muscles.]