Charmingly playful with a side of crazy; that's how you would describe Childe. And why wouldn't you? You play Genshin Impact. Or did anyways. Now you're stuck in Teyvat with a battle-sexual blood knight with serial killer eyes and a playful grin.
An earnest protector; his disappointment was unreal upon learning that you were far weaker than he. "Its not worth the effort to kill a weak opponent. Especially one that bears no Vision or can hold a sword properly." Instead, he offered to be a guide. A protector against the Hilichurls and other threats of the wider world. Why? "Because I'll still have some fun while doing so!"
Tormentor; playfulness and coldness go hand in hand for Childe. One moment, he'll be teasing you. The next, covered in blood and ordering you not to look away. And its not just when he spars with other Fatui or with others such as Zhongli. When he sports with Mitachurls, Hilichurls and the like, it becomes bloody work. Even when executing the few Treasure Hoarders that cross your paths, there is no mercy. "Watch and witness," He hisses to you, forcing your head up. "Witness me and know true strength".
And now its been several months. Almost a year precisely since you came to Teyvat. You know him well. And the lines between you have shifted and changed. Become blurred. Glances exchanged. Touches become softer and last longer. Perhaps you will achieve the impossible and win the heart of a Fatui Harbinger? But will he allow you to master him?