Analysis, Synergy, and Resonance
In this video, RIEN breaks down how all the characters in Genshin Impact synergize and interact with XIAO.
Do note, because of the way Xiao’s burst works, not many supports can work well with Xiao. This is an important factor in considering what characters to play with XIAO.
Also, you will want to consider whether he is the main DPS, or is used for cooldown.