A new unconfirmed leak states that Kuki Shinobu and Yelan will be playable in Genshin Impact 2.7.
That same leak states that Yelan is a 5-star character, whereas Kuki Shinobu is a 4-star character. However, it's worth mentioning that it's an unconfirmed leak, with the leaker even putting [Questionable] around it.
Past leaks had the same tag attached to them and ended up being accurate, but some past ones weren't correct.
Hence, readers should be somewhat skeptical until more evidence is provided. Yelan's model was recently leaked, which gives players more information about her than what they had months ago. Kuki Shinobu's model hasn't been leaked yet.
This leak merely states that these two characters will be in Genshin Impact 2.7 but doesn't state which phase or if they will be together. It's worth reiterating that this leak has the [Questionable] tag, so readers should take it with a pinch of salt.
That said, there are other leaks and official lore that give players more information about these two characters.
An older leak stated that Yelan would have the "Lady" model, while Kuki Shinobu would have the "Girl" model. The "Lady" model is the one that characters like Ningguang and Beidou use, and it's confirmed that Yelan does use it based on her leaked model.
This same leak also stated that Ayato uses the "Male" model, which was also confirmed to be the case. It's important to note that "Girl" refers to the model type that characters like Keqing use, not what the smaller characters like Sayu employ.
No Genshin Impact character mentions Yelan in their story or voice-overs. She's largely a mystery as far as official lore goes, but a few leaks cover some aspects of her character. First, she has a leaked model (seen above). Second,
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