I found the kuo-toa cave for the first time in my 3rd playthrough, and I noticed something small that really surprised me (in the best way).

I convinced Booal to take me on as his "Chosen," and went around the cave afterwards talking to all the kuo-toa in case there was anything else to do down there. Each of them had the same one thing to say-- but every single one of them said it differently. Different voice patterns and inflection points and so on. It sounded to me like they all used the same voice actor, which means this person re-recorded the same line of dialogue over and over in different ways so they would all be individuals. In a cave that a lot of players (probably most players, based on the completion rate) would never even see.

I just... omg you guys I love this game so much.