Due to the [[BrokenBase nature of]] [[UnpleasableFanbase this series]] ''Sonic the Hedgehog'' has many characters that can be considered EnsembleDarkhorse by [[PeripheryDemographic different sorts of fans]].
* [[WarriorMonk Knuckles the Echidna]], [[TheRival Shadow the Hedgehog]], [[DefrostingIceQueen Blaze the Cat]] and [[RobotMe Metal]] [[TheDragon Sonic]] are probably the most stand out examples among the fanbase.
* Fang the Sniper (known as Nack the Weasel in the U.S.) was a recurring character in the ''Sonic'' franchise between the years of 1994 and 1998 and has many fans who want him to make an appearance in anything. Some of these fans got their wish when he cameoed on a wanted poster in ''Sonic Generations''.
** For that matter, Mighty the Armadillo and Ray the Squirrel also got to appear on posters in ''Sonic Generations'' and are popular thanks to the [[WesternAnimation/SonicSatAM Archie]] comics even though they only appear in the games (''[=SegaSonic=] the Hedgehog'' and ''VideoGame/KnucklesChaotix'').
* All of the Chaotix are this, especially after ''Sonic Heroes'' revamped them into a trio of screwball, CrazyAwesome detectives. Espio especially. After all, he ''is'' a [[TheStoic no]]-[[StraightMan nonsense]] {{nin|ja}}[[InstantAwesomeJustAddNinja ja]] and the OnlySaneMan of the trio.
* Though they are controversial characters among the fanbase due to debuting in the infamous ''VideoGame/SonicTheHedgehog2006'', Silver the Hedgehog and Mephiles the Dark [[CultClassic have their share of fans]]. Silver, after his boss fight in ''Sonic Generations'' proved to be actually fun and also do to the ''Archie'' comics featuring his as a major character. Mephiles who while his plans are [[ComplexityAddiction so ridiculously complex that they should not work]], fans actually consider him a pretty cool villain. This could be attributed to [[HeroKiller actually killing Sonic]].
* [[KillerRobot E-123 Omega]], especially when he became an {{Expy}} of [[VideoGame/KnightsOfTheOldRepublic HK-47]] (see below).
* There's also [[TheRival Jet the Hawk]] and the [[QuirkyMiniBossSquad Babylon Rogues]] who have a sizable fanbase.
* [[IronWoobie E-102 Gamma]], [[WhatMeasureIsAMook extraordinaire]], is notable as one of the few faces in this series ''not'' to attract bile from the fanbase. His HeroicSacrifice ([[KilledOffForReal which stuck]], not counting [[CameBackWrong E-102r "Chaos" Gamma]] in ''[[VideoGame/SonicBattle Battle]]'') and [[TearJerker the nature of his existence in general]] most likely helped.
* [[EverythingsBetterWithPrincesses Tikal]] and [[ActionGirl Shade]], the female echidnas who each have a pretty big fanbase considering how little they've been in the games. Tikal actually managed to [[ShockingElimination defeat]] ''[[BigBad Dr. Eggman]]'' in [[http://sonic.wikia.com/wiki/Sonic_News_Network:Sonic_Character_Tournament/Week_29 Sonic Wiki's Character Tournament.]]
* [[DeadpanSnarker Orbot]] ([[FanNickname aka "Ergo"]]) from ''VideoGame/SonicUnleashed'' is shaping up to be next Darkhorse of the series. His [[WesternAnimation/AdventuresOfSonicTheHedgehog Scratch and Grounder]]-[[{{Expy}} esque]] dynamic with Cubot in ''[[VideoGame/SonicColors Colors]]'' further cements this.
* In another corner of the fandom, a great deal of prominence has been given to Honey the Cat, an extraordinarily detailed character who was DummiedOut of ''Sonic the Fighters''. This may have motivated Sega's decision to promote her to playable in the 2012 XboxLiveArcade & PlayStationNetwork UpdatedRerelease.
* [[WhatCouldHaveBeen Tiara]] has her fair share of fame despite never being properly released. Tiara's game (Sonic X-Treme) was infamously canceled.
* In addition you'll often find a strong fanbase of particular alternate media characters, many of which urging for them to appear in the games canon. Princess Sally Acorn has perhaps one of the most notable fanbases even compared to some games characters (even if it extends to BaseBreaker status) with Cosmo and Bunnie Rabbot also worth special mentioning.