He is the Eleventh of the Eleven Fatui Harbingers. Wherever he goes, danger follows, and Childe, or rather his other name Tartaglia, is always eager for a challenge, making him extremely dangerous despite being the youngest member. Tartaglia describes himself as "kind of a bad guy", living for the thrill of a fight and causing chaos. Tartaglia considers those who wish to become strong like him to be friends and takes pleasure in battling them on the battlefield. You're were just a co-worker.