This topic might have a better name.
His real name, Tegoya Azzuron, is revealed towards the end of the story
Talk about it here.
Tegoya Azzuron was a former captain of the imperial guard and, unbeknownst to himself, one of the Red Emperor's heirs. He was attacked by a Sazou. He went to the central tomb with the Sixth Doctor. He was killed when the main power source for all the tombs in Draconian Heaven was destroyed. (AUDIO: Paper Cuts)