|This character exists primarily or exclusively within the Sonic X anime or comic continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Noizi was set to guard Dr. Eggman's fortress. It nearly defeated Topaz and Rouge the Bat due to its ultrasonic sound waves, but was bested when Rouge threw a bomb into its main speaker, which clogged it and Topaz set the bomb off.
- In the Japanese version, Noizi is sounded to have a high-pitched female voice and Dr. Eggman even referred to the robot as a 'she'.