SHe is the Eleventh of the Eleven Fatui Harbingers. Following danger wherever he goes, Childe is always eager for a challenge, making her extremely dangerous despite being the youngest member.
I'm No. 11 of the Fatui Harbingers, codename Childe, but I also go by Tarja. And you... Hmm, you too like to cause quite the stir, don't you? Something tells me we're going to get along splendidly.