Don\'t know that guy either.
I do know though that if you thought the ending of TOB was too easy you can try out a mod called the ascension. It was created by one of the developers of BG. I think they have a download for it at fileplanet.com.
(you can even team up with Balthazar, so you don\'t have to kill him)
This will explain it a bit better:
David Gaider, Senior Designer for Baldur\'s Gate II: Throne of Bhaal, has released an unofficial mod for Throne of Bhaal called: Ascension. Ascension involves changes to the battles in the last chapter of ToB that often have many more enemies and spell effects going off on-screen than are found normally in the official release of the expansion. Ascension isn\'t all about making the combat more challenging. It\'s about making the ending to Throne of Bhaal longer, more fun and a little more fulfilling. It mostly affects the end part of the game, starting at the very end of Chapter 9 when you meet with Balthazar and climaxing at the site of the ascension in the Throne of Bhaal.