I am interested in this character (and due to College don't have time to read the 2nd book) so could you guys put here all the info we know about this man (and what he did during the storylines. I checked the Wikia and UESP but the info there is only for the first book.

TIL has lore notes and quotations for both the http://imperial-library.info/content/infernal-city-lore-notes and http://imperial-library.info/content/lord-souls-lore-notes book. They contain everything there is to know about him.