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 fully expected Xiao to die at the end of that 2.7 archon quest.
Childe's got a lot of death flags, I've been scared of that for a couple years now.