What nickname is often used for Doug Rattmann in Portal lore? He is often called Ratman.
Doug Rattmann was an Aperture Science scientist who survived the neurotoxin release that killed most of the facility’s staff. Afterward, he hid in secret maintenance spaces and created what fans call Ratman dens, leaving drawings, warnings, and messages on the walls.
The nickname comes directly from his role as the hidden, paranoid survivor living among the test chambers. Rattmann is not a conventional on-screen companion in the original Portal; much of his story is conveyed through environmental details. His full history is expanded in Portal 2: Lab Rat, a webcomic released before Portal 2.
Rattmann’s actions are crucial to Portal’s backstory. He recognized Chell’s unusual determination, moved her to the top of the testing queue, and left clues warning her about GLaDOS’s deception. The name is usually written “Ratman,” without a space, although it is a descriptive nickname rather than his legal name. “Doug Rattmann” remains the character’s formal name.