Despite having a good look at their personality, nothing is truly known about the Administrator. Their real name, actual age, race, or anything else, for that matter. Everything is left blank on purpose.
By the end of "Frozen Corridors", these mysteries aren't revisited:
Did Lamda Spatari's sister truly sacrifice herself for Regina, or was it Regina rationalizing her death through Sylkie's words as a result of being touched by the girl's gesture when Regina's health was declining?
Why didn't Rivet and Lamda mistake Sylkie for Lamda's sister despite both of them knowing the latter in life and acknowledging Sylkie as "Regina's caretaker" across the event?
Rivet can be partially excused as adapting to Regina's delusion. Regina being an Unreliable Narrator still doesn't explain scenes of Sylkie while Regina's absent...
Rivet offhandedly mentions that the CEO couldn't sense Sylkie at all. Considering the player was aware of Sylkie, was this actually the CEO Obfuscating Stupidity in front of Rivet?
The CEO seems to have wanted Regina to find her inner strength, and Sylkie's words were keeping her from finding it.
The Nanaharas were able to revive people using Divinity with no side effects. Why did Edel use human sacrifices to revive Regina, when she had more than enough Divinity as a Demon Lord?
Using your Divinity to revive someone makes you lose your Divinity; that was the side effect. Perhaps it's an all-or-nothing deal if you try to cheat it by fragmenting yourself (and Edel won't sacrifice her existence just to save Regina), or perhaps a Demon Lord's Divinity isn't theirs to discard outside a Qliphoth Game (under threat of Tammiel's judgment, maybe).
What's the point of the Qilphoth Games? Is it a way to resolve a lover's spat between the Administrator and Tammiel, or is it a benevolent action on Tammiel's part to grant wishes to those who work hard? Why is Tammiel willingly creating and helping raise her own enemy? Is it decide who is a better parent and loser dies? What if the Tammiel and Administrator we see are not their true forms, but Avatars? Would that justify all the life-and-death as literally being a Game? Custody battle via the lives of NPCS/Lower Liforms?