Cnaüir urs Skiötha, and his damned, smoking ruin of a soul. I don't think it was fan service. TBH, I think that he will have a critical role in TUC. If he doesnt, I will be hugely disappointed.
The Proyas/Kellhus talks and the way Kellhus just strips (literally) him bare, was great. So much revelation.
Ishterebinth. Sorweel has quickly become one of my favorite character, even though I was warming to him by the end of WLW. Ironically, after his revelation that Kellhus is his saviour, I still feel there is a huuuge chance that he will indeed do what the WLW couldn't. And, it's got me thinking, if Yatwer seen the death of Kellhus at the hands of the WLW, why would have she placed trust in Sorweel also? There's a thread in that question.