Postulio The Janitor is a secret spy enforcer of the Bad People, under Dark Studious' rule. He is not a full time member of the Bad People, but acts more as a spy, crossing into Earth to lure humans into the hands of the Bad People. He was killed by Luigi at the final battle against the Bad People.
Postulio is a very quiet and stoic man, and possibly the calmest member of the Bad People. He always has a sly smile on his face, and is willing to kill anyone. The only times he has ever stopped smiling is when Dib destroyed the blueprints to the Bad People's weapon of mass destruction, and when he was killed by Luigi.