All of them tell a complete "story" of their fall if you assemble their dialogue in some semblance of order. So its less of a monologue and, much like Dark Souls, a bunch of random one liners that tell a bigger story.

But the ones I was thinking of when I wrote that were specifically Wader, Toasty and yes Pigskin from the first game, as well as Spider and Brute in the second. And Baby Jane in both.

Each one in the context of Rapture presents a specific moral quandary about its world that focusing on the "big stars" like Atlas and Ryan never could. Focusing on those extremes is basically useless because its all vacuum philosophy based on larger than life guys, wherein the Splicers present real problems that exist in our current world and how more "power/technology/freedom" could exacerbate them into horrific levels.

Also, Brute is my boy and is full of legitimately good quotes for everyday life.