Serving as the Freedom Fighters' resident mechanic and inventor in the Sonic the Hedgehog TV series, Rotor the Walrus created many of Knothole Village's surveillance and security systems. Although a bit clumsy, Rotor has proven himself valiant and courageous throughout the war against Dr. Robotnik.
Background: Not much is known about his background (in the cartoon), but he's very good with machines.
In the Sonic the Hedgehog comic series, Rotor's appearance from 1993 to 2003 is a purple walrus, with a yellow baseball cap, and a toolbelt. In late 1999, he had an updated Sonic Adventure look, with Green Eyes. Since late 2003, his appearance has featured his traditional yellow cap, but now has a brown jacket and glasses as well. In the first several issues of the comic he was known as "Boomer".
Rotor's family includes, a mother, a father named Sherman, who disappeared along with Rotor's older brother, and also a younger brother named Skeeter. However, Dr. Robotnik has hypnotized the walrus herd, which included Rotor's Mom, and Skeeter.
In the miniseries that started off the American Sonic comics, Rotor was instead named Boomer.
In late 2004 of the comics, Rotor gained a new intelligent partner named Tommy Turtle, who's also known as Agent from K.N.O.T.H.O.L.E.
According to Ken Penders, Rotor's comic counterpart was supposed to be written in as a homosexual, notably in the Mobius: 25 Years Later saga. Ken had planted clues in the story to elude to this, but as Rotor was deemed to be underdeveloped, this idea did not continue on. 
|Sonic the Hedgehog (Alternate Media) characters|
|Heroes||Sonic (Super, Dark Super, the Werehog) | Tails (Super, Turbo) | Knuckles (Super, Hyper) | Amy Rose | Cream | Blaze | G.U.N. (Commander) | Emerl | Silver (Super) | Marine | Shade | Sally | Bunnie | Antione | Rotor | Sonia | Manic | Shahra | Knights of the Round Table | Caliburn | Yacker | Cosmo|
|Anti-heroes/ Neutrals||Shadow (Super) | Rouge | Espio | Charmy | Vector | Mighty | Ray | Julie-su | E-102 Gamma | Chaos (Perfect) | E-123 Omega | Jet | Wave | Storm | Merlina | Aleena|
|Villains||Dr. Eggman | Metal Sonic | Snively | Cluck | Dark Oak | E-Series | Fang | Bean | Bark | Eggman Nega | Battle Kukku Army | Metarex | Black Doom | Erazor|
|Teams||Sonic/Heroes | Rose | Dark | Chaotix | Babylon|
|Others||Gerald & Maria Robotnik | Chris | Chao | Tikal | Big | E-101 Beta | Heavy and Bomb | Flicky | Animals | Galaxina | Earthia|