- MoKaz the Snail
- Mobia
- Mobian Confederation
- Mobian Cop Bad Cop
- Mobian Defense League
- Mobian Defense League (Flawed Deites version)
- Mobian Empire
- Mobian Future
- Mobian Gems
- Mobian Media Network
- Mobian Media Network Radio
- Mobian Mysteries Detective Agency
- MobiansTropolis (A.K.A SegaCon)
- Mobius
- Mobius-2
- Mobius/Gaia
- Mobius/Mobius Redrawn
- Mobius: The Future Chronicles
- Mobius (CHC)
- Mobius (Sonic Piece)
- Mobius (Tales of the Echo Universe)
- Mobius Chronicles:Abilities
- Mobius Chronicles:Characters
- Mobius Chronicles:Magic Spells
- Mobius Chronicles:Weapons
- Mobius Corners (EH)
- Mobius Corners Metropolitan Airport
- Mobius Countdown
- Mobius Crystal
- Mobius Dragons
- Mobius Fighting Tournament
- Mobius Future
- Mobius Questions
- Mobius Rings
- Mobius Suppression Squad
- Mobius TV
- Mobius Twist
- Mobius Twist: Freedom Fighters of Knothole
- Mobius shattering earthquake, escape from Labyrinth Zone
- Mobiusball
- Mobodoon
- Mobodoon (AngieYaz Sonic Underground reboot)
- Mochi
- Modeo the Dragon
- Modern Birthdays
- Modern Care For Your Chick-of-Prey
- Modifiable Armaments
- Moe
- Moe Flippercorn
- Moebius
- Mojo the Monkey
- Mokuteki the Panda
- Molly
- Molly the Hedgehog
- Moltagus
- Molten Lake
- Momenta the Hedgehog
- Momentum the Armadillo
- Momma Robotnik (Fanon)
- Momo the Caracal
- Momo the Peach Fox
- Mona the Mink
- Monday the Wolf
- Monica DeLouise
- Monica the Fox
- Monica the hedgehog
- Monk the Cat
- Monlie The monkey
- Monnica the Ghost Girl
- Mono The Hedgehog
- Monochrome the Sheep
- Monsoon Spear
- Monster (Monster World series)
- Monsters of The Stone
- Monty J. T. Vao
- Monty the Dog
- Moon Children Cult
- Moon Fairy Moths
- Moon the Echidna
- Moonbeam's Adventurous Life: The Past
- Mooncloud
- Moone the Hedgehog
- Moonlight (Element)
- Moonshine Asgard
- Mop the Cat
- Moray the Eagle
- Morbius Van der Vlad
- More Continued Falling
- Morfun Bris
- Morgan E. Stallion
- Morgan Kunzite
- Morilec the Hunter
- Mormon Woods
- Moros C. Nekrozia
- Moros C. Nekrozia/Interactions with others
- Morph Watch
- Mortask the Galvortano
- Mortem The Vampire Prince
- Morwena Trancina
- Mothra
- Mountain Demon
- Moving In
- Mozilla the Fire Fox
- Mr. Clean
- Mr. Gold the Rabbit
- Mr. King Blox
- Mr. Marcos
- Mr. Strings
- Mr. U / Mr. Unknown
- Mt. Atlas
- Mt. Everest
- Mt. Greyhorn
- Muck the Wolf
- Muerte the Opossum
- Mugenken
- Mukuro the Goshawk
- Multi-Colored Chaos Emerald
- Mundus (Continent)
- Mungo-type APC
- Munu the Dragon
- Mura the Mink
- Muramasa Thunder
- Muramasa the Hedgehog
- Murica the Eagle
- Murky the Hedgehog
- Murtagh Veschell
- Muscavania
- Mustela Erminea
- Mutant (categorization)
- Muutma the Flamingo
- My Better Game Infobox
- My Sweet Life
- My Sweet Life/MSL01
- My Sweet Life/MSL02
- My Sweet Life/MSL03
- My Sweet Life/MSL04
- My Sweet Life/MSL05
- My Sweet Life/MSL06
- My Sweet Life/MSL07
- My Sweet Life/MSL08
- My Sweet Life/MSL09
- My Sweet Life/MSL10
- My Sweet Life/MSL11
- My Sweet Life/MSL12
- My Sweet Life/MSL13
- My Sweet Life/MSL14
- My Sweet Life/MSL15
- My Sweet Life/MSL16
- My Sweet Life/MSL17
- My Sweet Life/MSL18
- My Sweet Life/MSL19
- My Sweet Life/MSL20
- My Sweet Life/MSL21
- My Sweet Life/MSL22
- My Sweet Life/MSL23
- My Sweet Life/MSL24
- My Sweet Life/MSL25
- My Sweet Life/MSL26
- My Sweet Life/SOSS01
- My Sweet Life/SOSS02
- My Sweet Life/SOSS03
- My Sweet Life/SOSS04
- My Sweet Life/SOSS05
- My Sweet Life/SOSS06
- My Sweet Life/SOSS07
- My Sweet Life/SOSS08
- My Sweet Life/SOSS09
- My Sweet Life/SOSS10
- My Sweet Life/SOSS11
- My Sweet Life/SOSS12
- My Sweet Life: Escape From the Paparazzi
- My Sweet Life: Escape From the Paparazzi/Alexis's Story
- My Sweet Life: Escape From the Paparazzi/Characters
- My Sweet Life: Escape From the Paparazzi/David's Story
- Mylanthesis the Cat
- Myles McCloud
- Mynx the Neutron
- Myoti the Bat
- Myrskyjen the Hawk
- Mysha ''Dawn'' The HedgeFox
- Mysterious Ancient Masks
- Mysterious Cat Country
- Mystery the Hedgehog (MtH)
- Mystery the hedgehog
- Mystic Beings
- Mystic Monkey
- Mystic Monkey (Comic)
- Mystic Monkey (game)
- Mystic Ruins
- Mystic Zone
- Mystic Zone/Gameplay
- Mysticism of Mobians
- Mysung the Hedgehog
- Mythika the Panther
- Mythril
- Māro
- Męka Niki
- N-135 Ronin
- N-170 "Ares"
- NEPS (None-Effective Programming Syndrome)
- NICOLE the Holo-Lynx (Marshalia13's Universe)
- N the Hedgehog
- Na Cheng
- Nack the Weasel/Elements of Power
- Nage the Chameleon
- Nagny the Light Dragon
- Naiche Horning
- Naja
- Nakoma the Fox
- Nalia The Hedgehog
- Namgge nega
- Nami the Tanuki
- Nana the Mink
- Nancy Aligan
- Nancy the Cat
- Nano the Hedgefox
- Nanoimals Two
- Nanostrutturata the Demonhog
- Naomi Mongoose
- Naomi Williams
- Naomi the Fox
- Naoya Tsukino the Wolf
- Napalm (Element)
- Naril Metropolitan
- Nash the Shark
- Nasty Plot
- Natalia the Hedgehog
- Natalie Alister
- Natalie Vida Sweeney
- Natalie Walker
- Natalie Walker/Disaster Club
- Natalie the Chameleon
- Natalya "Samantha" Vixi
- Natalya the DarkHawk
- Natasha Romanov
- Nate the Hawk
- Nathan P. Bear
- Nathan the Wolf
- Nathanyl the Hedgehog
- Native Gaians
- Natsu the Hedgehog
- Natsu the Hedgehog (Character)
- Natsu the Hedgehog Story
- Natural Cure
- Natural Gift
- Nature (Element)
- Nature Barriers
- Nature Clan of Mokuhana
- Nature Clan of Mokuhana/Members
- Naugus (Re: Sonic GX)
- Navro the Hedgehog
- Nazo's Adventures: Chapter 1: The Beginning
- Nazo (Adventures)
- Nazo the Hedgehog
- Nazo the Hedgehog (Sonic Blades version)
- Nazuna the Bobtail
- Nebula
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