Not much is known about him, save that his primary occupation is that of a general. In this capacity, he has served both Shinnok and Shao Kahn. He has also served as a member of the Brotherhood of Shadow. During Shinnok's war against the Elder Gods, he was presumed killed. He later resurfaced during the time of Mortal Kombat 4, but after Shinnok was defeated, he disappeared once again. He later emerged in Shao Kahn's army, to whom he has served until now. In his Armageddon bio card, John Vogel states that Reiko received the position of general as Shao Kahn approved of the fighter's ruthlessness, which he is said to look for in his soldiers.