My mind keeps on wandering to an idea of an au I had, not sure if this would be during specifically the time loop in MoL, or other time loops, but I love the idea of Zorian being recruited (read: extorted) by the angels to forever be an assistant to the time loops. A template is permanently created for the Sovereign gate that is created at the beginning of each loop. This is to give the main controller a friend across all loops, an advisor, and a resource to do the ethically ambiguous things that they can't do due to the contract.
I'm not exactly sure how it would out, but I just really like the idea of a Zorian after being a loop copy escaping to the real world instead of circumventing punishment is forced into service by the angels, and this cynical, curious, and otherwise normal boy is forced to be the angel's lapdog. Basically a dynamic not too dissimilar from Celestial warlocks in d&d but the patrons are much more involved and controlling.
In each loop Zorian is created whole cloth, with the angels visiting the real world before hand to set up ways for him to integrate into society like they prepared the Sulrothum in the book. He primarily spends a few loops getting used to the cover story and the new culture & time period he finds himself in and then approaches the main controller once they've properly adjusted to the loop. he's been giving orders to help them with everything but he has his own spite, reservations, and rebellions to this, exercising his free will whenever possible.
Zorian and the new controller getting closer together is never a question of if but how long, since they're the only two that will never lose awareness of the loops. It also is a point of tension if the controller empathizes with Zorian's permanent servitude or not. No matter what the controller will hide some of the joy and gratitude they have they'll have a permanent friend (Zorian's empathy powers make the attempts to hide useless)
A couple of thoughts on how this could work:
1) Zorian is recruited after the events of Mother of Learning and is forced to be the advisor/guide/confidant of the next controller, but somehow the time loop is fucked up even more and he and the new protagonist have to scramble to fix/ survive this mess. This is with a new cast of characters in the future focusing on how the world modernizes and changes to cultural norms.
2) Zorian actually was recruited and existed before the events of MoL and inverses the dynamic of Zach and Zorian, where Zorian is the more experience time traveler of the two. Zach almost definitely harbors a puppy crush at the cool nerdy archmage in his corner and Zorian appreciates a controller that is more on his side than others. Zorian is initially suspicious of Jornak and Zach dissmisses it as jealousy. When Zorian thwarts Jornak's scheme Zach embarrassingly sits through an "I told you so lecture" (and maybe the two talk about why Zach assumed jealousy was the key motivator from Zorian).
3) Zorian's service is timeless and he's forced to be there for all loops, even in the ancient past. He has to be the assistant to Shutur-Tanara as a young person, and deals with the crisis of being there for so much ancient history. (Also in this version Shutur-Tanara is a trans woman. No reason specifically why but I think it'd be great if Zorian's main concern is trying to stop imperialism and colonization and his modern cultural norms meanwhile Shutur-Tanara's main thought's are "man I wish I was born a woman." Eventually when Zorian is educating her on modern concepts he mentions trans people and that catches Shutur's attention.
ST: "Wait, that's a thing? What magic is needed to change my body?"
ZK: "I will cover that later once you agree that conquering continents and colonizing other cultures are bad."
ST: ". . . make me a woman and I'll try to listen with a more open mind.")
Zorian also meets some of the eleven immortals and a young Quatch-Ichl who he ends up taking a partially mentor/parental role within the time loop.
Idk, there's a lot in this idea that I'm really interested in and would be curious to hear everyone else's thoughts.