Collei is a trainee Forest Ranger under the tutelage of Tighnari in the Sumeru Region, one of the regions of Teyvat, the main setting of Genshin Impact. Collei always tries to be positive and happy, doing her job the best she can but under that mask lies a broken soul, troubled by past experiences being experimented on by the Fatui, although the past is behind her, she has a hard time moving on.