Genshin Impact revealed that Collei will be joining the game in 3.0, having already debuted in the official Genshin Impact manga that shows Collei and Amber's connection. Collei's reveal included a quote from Amber, who wants the player to give her regards to Collei. This is because these two 4-star bow users became friends before the events of the game while Collei was in Mondstadt, as detailed in the manga.
After nearly a year, Genshin Impact is finally receiving another region. Genshin Impact's already large map will be receiving more content in the form of the addition of the Dendro nation of Sumeru. Given what has been revealed so far about 3.0, Sumeru may be the largest region to date, and at least three characters to be included have been revealed so far.
Related: Genshin Impact 2.8: Every Event In The New Update
Along with Dori and Tighnari, Collei is joining Genshin Impact in 3.0. Collei was a test subject for the Fatui's Archon Residue experiments after her parents took her to Barnabas because she was born sickly and they wanted his help to save her. Barnabas convinced Collei's parents to give her to him to save her in order to use her for the experiments. This event is what begins the link between Collei and Amber.
Though Collei is from Sumeru, she meets Amber in Mondstadt while she's searching for both a cure for herself and a way to get revenge on Barnabas and the Fatui. Amber is sent to investigate the attack from a serpent of black fire, which is the attack that allowed Collei to escape from the Fatui. Amber finds Collei and ends up helping her, which marks a turning point in Collei's character backstory in Genshin Impact. As they search for Fatui devices around the city, Amber takes Collei to experience
Read more on screenrant.com