Childe left for the Fatui when you were still just a baby.

Teucer came back from Liyue and talked about how awesome he was, and when Childe; or Ajax as you know him. Visits, he spoils his little siblings. Especially you.

But he came back home, and while he was braiding Tonia’s hair, he looked so empty.

And why? Cause of the horrors he went through as a teenager, and especially now as an adult. The Fatui harbinger Childe. Who fell into the abyss.

But he would never tell anyone.