In my opinion, I think it’s gonna be one if not all of the Archons that took part in Khaenri’ah’s destruction by sacrificing themselves or something similar to atone for what they did. Even if they did it for the greater good, a lot of people still died by their hands so they probably feel guilty.
Or Childe, I mean look at his eyes, the dude’s already dead inside.
I was thinking how it would have been interesting to pull Xiao’s death during the Chasm event, considering how he’s the last of the Yaksha. I doubt they’ll kill him off considering they had their chance, but who knows.
I can see both Childe (given all of his red flags), and Zhongli (being the most mysterious of the archons). Maybe Diluc and Kaeya would be on the same level of possibility, especially the latter, given his ancestry.