Archie Comics

Archie comics has been publishing original comic adaptions of Sonic X and Sonic the Hedgehog (or SatAM). Both comics are officially sponsored by Sega and are ongoing.

Sonic the Hedgehog (SatAM)
Published since 1993, it follows the American Sonic cartoon from where it last left off and contains the characters most essential to it's storyline with many Archie exclusive characters. Occasionally, they are combined with actual cartoon or game adaptions.

Characters

 * Sonic
 * Tails
 * Knuckles
 * Amy
 * Fang
 * Other Freedom Fighters:
 * Sally
 * Rotor
 * Antoine
 * Bunnie
 * The Chaotix:
 * Mighty
 * Espio
 * Vector
 * Charmy
 * Ray
 * Eggman
 * Snively
 * Scourge
 * Fiona
 * Rouge
 * Shadow
 * Metal Sonic and many Metal/Mecha/roboticized characters
 * Mogul
 * Julie-Su

Sonic X
The comics have been in existence since the end of at least the first Sonic X series. The majority of the series involves real-life relations or other Sonic games that tie into the main storyline of the games. So far, all of the comics have taken place between Sonic's Chaos Control to Earth and before they learn of the two worlds meshing together.

Characters
Many game characters have had cameo appearances, including Cosmo who never appeared until around the time Series 2 of Sonic X was announced. Shadow has yet to appear.
 * Sonic
 * [[Tails]
 * Knuckles
 * Amy
 * Eggman
 * Rouge
 * Cream and Cheese
 * Decoe and Bocoe
 * Bokkun
 * Chuck
 * Ella
 * Mr. Tanaka
 * Chris
 * Emerl
 * Topaz
 * Scarlet Garcia

Cameos
There have been characters scheduled for the comics that have yet to appear, like Omega.
 * Dulcy (SatAM)
 * King Acorn (SatAM)
 * Jet and the Babylon Rogues (SatAM)
 * Blaze (SatAM)
 * Scratch and Grounder (SatAM)
 * Honey (SatAM): She is different from her Sonic the Fighters design.
 * Heavy and Bomb, Bean, Bark, and Black Doom (SatAM)
 * Big, President and Chaos (both)
 * Emerl (Sonic X)
 * Danny (Sonic X)
 * EggRobo (Sonic X)
 * Tails Doll (Sonic X)

Trivia

 * The team who made the Sonic cartoon worked closely with Archie for the first few issues.
 * Both sets started with a four-issue mini-series to see if the series would gain much popularity. Later issues state connections to them as part of the main storyline. NiGHTS also had a 3-issue adaption-- twice. Unfortunately, the series fell.
 * Surprisingly, even though Archie made their own characters for the first Sonic comic series, Nazo was never even hinted at in the Sonic X comics.
 * Sally, Tails, and Knuckles had their own series.
 * Sonic X, though closer in canonicity to the games, does not have a game adaption in the comics.