Tenmyouji

A stubborn, obstinate old man. He takes a harsh, offensive attitude with the other members, who he distrusts. He was once a subject at a simulation facility for a manned mission to Mars, where a mass murder took place. He was the sole survivor of the incident.

[Spoiler] At the game's finale it is discovered that he is Junpei, the hero of the first Zero escape game "999", by a very old Akane, someone who was a player in "999" and Junpei's childhood friend. [/Spoiler]