Thornheart, also known as the Mystery Man by fans, is a mysterious man and one of the main antagonists of the House of the Dead series. He is a business suit who walks with a noticeable limp.
Little is known about the Mystery Man's identity and motives. While fan theories have materialized, all are unconfirmed and many were debunked.
The theory that he was Goldman, who perhaps had survived his suicide in The House of the Dead 2, was disproven in 4; Goldman's death is reaffirmed, and the Mystery Man's voice and appearance suggest that he is another character altogether. Takashi Oda also stated that The House of the Dead III was the Mystery Man's first appearance, debunking theories of Harry Harris from 2 and Papa Caesar from The House of the Dead: Overkill being his identity.
One of Gjallarhorn's Mobile Suit pilot, he was among the three Graze pilots sent to attack Chryse Guard Security's base. He retreated from the battle afterwards when one of the members, Milinda Brantini piloted ASW-G-08 Gundam Barbatos and defeated one Graze and damaged another, followed by the fact that his resistance were children.
Refusing to follow Gjallarhorn's orders to cleanse evidences of their defeat, Thornheart challenged Milinda in a Mobile Suit battle and demanded Futaba Ichinose as his winning prize. After being defeated, he requested Milinda to end his life and the latter does so by firing at him with a handgun.
Chronicles of Great New Empire
Thornhart is known by the nickname "Pilate".Zephyr finally seizes an opportunity to kill Thornheart.