From Lexicanum

Thaddeus is an Assault Marine Sergeant in the Blood Ravens 5th Company (promoted shortly before the events in Dawn of War II). He was a native undercity gang leader on the Hive World Meridian before his personal recruitment into the Blood Ravens by Captain Davian Thule. He has a reputation as a brash and idealistic brawler; and made his name battling Feral Orks on Calderis and Typhon Primaris.

Equipment

Thaddeus is armed with a typical Chainsword and a typical Bolter Pistol. Later through the campaign, pending the players choices he can be made to wield various Power Weapons. Thaddeus can be upgraded with Terminator Armour and can be turned into a Terminator Assault Squad.

Sources

• Dawn of War II
• http://www.dawnofwar2.com/us/info/squadleaders/thaddeus