J. Katayama

"I'm not going anywhere until I know all those things are dead."

- J. Katayama to the Marine

J. Katayama is a minor character in Doom 3. He was a maintenance worker assigned to the Caverns area who managed to survive through a huge chunk from the demonic invasion, thus being the last survivor the player encounters.

The player will find Katayama hiding under the thermal regulation pumps from the demons. He questions on the player's arrival, asking them to leave for fear that they can attract the demons to his hiding location. He then asks the player to take his keycard, which will allow them to gain entry further into the Caverns. If the player persists in speaking to him, he will refuse to leave and asks the player to leave immediately to seek help.

His fate is unknown, but the intro of Resurrection of Evil states that only one survivor (the Marine) was found, suggesting he eventually succumbed to the invasion. On the other hand, given that he had survived long enough shortly before the Marine seals the final portal and thus subduing the invasion, he may have persisted further by staying at his place before a rescue party find him.