|This character exists primarily or exclusively within the Sonic X continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
When Topaz and Rouge attempted to steal the Chaos Emerald at Dr. Eggman's fortress, Noizi was alerted to this theft and attacked them. It nearly defeated the agents 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, destroying it.
- 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'.
|Heroes||Sonic | Tails | Amy | Knuckles | Cream | Cheese | Christopher Thorndyke | Big | Tikal | Vector | Espio | Charmy | Cosmo | Chuck Thorndyke | Helen | Danny | Frances | Nelson Thorndyke | Lindsey Thorndyke | Sam Speed | Ella | Mr. Tanaka | Mr. Stewart | Topaz | Hawk | Froggy | Emerl|
|Neutral/Anti-hero||Shadow | Rouge | Chaos | Gamma | ZERO | Beta | Delta | Epsilon | Zeta | Pachacamac|
|Villains||Eggman | Decoe | Bocoe | Bokkun | King Boom Boo | Bio Lizard | Dark Oak | Red Pine | Yellow Zelkova | Pale Bayleaf | Black Narcissus|
|Groups||Eggman Empire | E-Series | Chao | S-Team | G.U.N. | Chaotix | Cosmo's species | Metarex|
|Miscellaneous||Vanilla | President | Christina Cooper | Jerome Wise | Scarlet Garcia | Captain Westwood | Gerald Robotnik | Maria | Lily | Doctor Kai Narasu | Hector Dragg | Li Yan | Howard Watcher | Card Passer | Albert Butler | Elmer Johnson | Principal | Mayor | Next | Molly | Leon | Earthia | Galaxina | Landar | Daisy | Starla|