I am about to beat it for the first time. 200 measly hours in. I want to do a Durge run next. I know he's a dick but I am the Emperor's biggest fan. I took the astral tadpole so I wish we could fly of into the Astral Plane together at the end. (I'm on the last push as we speak)
I mentioned this earlier, but I'll add onto it here...
Try to exhaust some dialogue options with Minsc in order to gain his perspective about the Emperor. He says something very insightful about how the Emperor's ability to coax others into doing what he wants is based on showing them
exactly what they want to be shown. That's where Minsc, as retarded as he appears to be, shows how insightful he truly is. Minsc tells you that the Emperor showed him a vision of his old wychlaran, Dynaheir (from OG Baldur's Gate). The problem, however, is the Emperor showed Minsc a vision that was far too ideal.
This is another theme throughout the game: denying what you want and striving for what you
need. Sometimes, what you want and what you need do not necessarily align...
Ascension is what Astarion wants but it is not what he needs.
Becoming a Dark Justiciar is what Shadowhear wants but not what she needs.
Becoming Vlakkith's
kith'rak is what Lae'zel wants but not what she needs.
Taking the Crown of Karsus and becoming a god is what Gale wants but not he needs.
This is also why mind flayers are so insidious and also why I'm miffed about there being zero in-game consequences for consuming more tadpoles.
Every interaction with the Emperor has him responding exactly the way he knows you
want him to respond. And much of this is due the fact that
he has all the memories of one of the world's greatest adventurers: Balduran. But, as Minsc points out, the fact that everything aligns so perfectly is all the evidence you need to know you're being deceived. Mind Flayers are basically the organic equivalent to ChatGPT or some other AI.
They have no souls, as Withers is keen to point out. Even if the PC, a companion, or Orpheus decides to become one, they still die. At that point, the mind flayer is basically a snapshot of whomever the person was before. They have all the memories, but none of the soul.