Negative Noise are a form of Noise. They show up as a yellow noise symbol when scanned. They are made up of the same species as Chump Noise, but they possess people and objects in the Realground feeding off the imagination of those individuals. The imagination consumed by Negative Noise in this manner is destroyed. This causes the individuals possessed by Negative Noise to be flooded with negative emotions. These negative emotions also have the side effect of attracting Chump Noise to the area.
Many missions in the Reapers' Game involve the discovery and erasure of Negative Noise.