What if Sega never left the video game console market?/Sonic the Hedgehog

Sonic the Hedgehog is a Japanese adventure-science-fiction platformer video game series created by, and , being developed by Sonic Team and published by Sega since June 23rd, 1991.

Main series
The series follows Sonic traveling around Mobius, defending from evil, primarily from the dangerous Doctor Eggman and his robot army.

Adventure
Eggman ends up freeing an entity known as Chaos as Sonic and his friends race to stop Chaos while learning of his connection to Knuckles' tribe.

Adventure 2
Eggman returns now with the help of a mysterious black hedgehog and a bat thief as they plot to activate a canon hidden in the stars as Sonic and his friends race to stop them.

Heroes
Sonic and his friends, alongside a few other figures, get invited by Eggman for a mysterious reason as all of them race to figure out what Eggman is planning before it is too late.

Armageddon
Two mysterious entities, a dark god known as Mephiles and a raging fiery demon known as Iblis, are on a path of destruction as Sonic heads to stop them, soon having to deal with a traveler from the future and the fate of a sovereign nation.

Unleashed
While venturing, Sonic gets attached to strange dark energy and transforms into a werewolf-like beast as he has to join an amnesiac chipmunk on a quest to stop Eggman from creating "Eggmanland".

Colors
A new theme park known as Eggmanland opens, with Eggman claiming to have turned a new leaf, as Sonic and Tails learn that Eggman has actually been enslaving creatures called Wisps as Sonic have to use these wisps to stop Eggman.

Generations
Eggman ends up accidentally freeing an entity known as the Time Eater that starts to merge the past and present as Sonic has to work with his past self to fix the timeline.

Rise of the Zeti
Eggman learns of and unleashes an extinct race of conquerors and forms an alliance with their king to conquer Mobius as Sonic alongside an archeologist known as Dust the Bunny heads to stop the Zeti from conquering Mobius like they had years in the past.

Forces
Eggman has succeeded in conquering Mobius with the help of an ultra-powerful mercenary known as Infinite as Sonic has gone missing. In his absence, Tails and the mysterious mercenary with a heart known as Whisper head to find Sonic and liberate Mobius.

Frontiers
Sonic awakes in a mysterious island with all of his friends missing as he heads to find them while dealing with a mysterious AI known as Sage.

Sonic Rush
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Sonic Riders
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Sonic Boom
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Out of This Universe
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Games

 * 1) Sonic Adventure (1999)
 * 2) Sonic Adventure 2 (2001)
 * 3) Sonic Heroes (2003)
 * 4) /Sonic Armageddon/ (2006)
 * 5) Sonic Unleashed (2008)
 * 6) Sonic Colors (2010)
 * 7) /Sonic Generations/ (2011)
 * 8) /Sonic: Rise of the Zeti/ (2013)
 * 9) /Sonic Forces/ (2017)
 * 10) Sonic Frontiers (2022)

Handheld

 * 1) Sonic Advance (2001)
 * 2) Sonic Advance 2 (2002)
 * 3) Sonic Battle (2003)
 * 4) Sonic Pinball Party (2003)
 * 5) Sonic Advance 3 (2004)
 * 6) Sonic Rush (2005)
 * 7) /Sonic Rivals/ (2006)
 * 8) /Sonic Rush Adventure/ (2007)
 * 9) /Sonic Rivals 2/ (2007)
 * 10) Sonic Chronicles: The Dark Brotherhood (2008)

Spin-offs

 * 1) Sonic Shuffle (2000)
 * 2) /Shadow the Hedgehog/ (2005)
 * 3) /The Tale of Tails/ (2007)
 * 4) /The Chao Garden/ (2009)
 * 5) /Sonic the Hedgehog 4/ (2010)
 * 6) /Sonic Brawl/ (2012)
 * 7) Sonic Mania (2017)
 * 8) /Team Sonic Racing/ (2019)

Sonic Riders

 * 1) Sonic Riders (2006)
 * 2) Sonic Riders: Zero Gravity (2008)
 * 3) /Sonic Free Riders/ (2010)
 * 4) /Sonic Riders: World Tour/ (2013)

Sonic Boom

 * 1) /Sonic Boom: Shattered Crystal/ (2014)
 * 2) /Sonic Boom: Fire & Ice/ (2016)
 * 3) /Sonic Boom: Out of This Universe/ (2018)

Pre-Adventure

 * Sonic the Hedgehog (voiced by Roger Craig Smith since 2010) - a cocky yet fun-loving hedgehog who loves the thrill of adventure as he often thwarts the schemes of Eggman.
 * Miles "Tails" Prower (voiced by Kate Higgins from 2010 until 2014 and Colleen O'Shaughnessey afterwards) - an intelligent and occasionally anxious fox who is a skilled inventor as he is Sonic's best friend, loving to work with his buddy.
 * Knuckles the Echidna (voiced by Travis Willingham since 2010) - a stoic yet somewhat naïve echidna who makes it his goal to protect the Master Emerald as he is somewhat friends with Sonic.
 * Amy Rose (voiced by Cindy Robinson since 2010) - a giddy and energetic hedgehog who is both a practicing fortune teller and has a crush on Sonic, often joining him on his adventures.

Introduced in Adventure 2

 * Shadow the Hedgehog (voiced by Kirk Thornton since 2010) - an experiment created by Dr. Gerald Robotnik to be the Ultimate Lifeform as he was contained after being declared too dangerous as he soon breaks free and grows a rivalry with Sonic.

Introduced in Rush

 * Blaze the Cat (voiced by Laura Bailey from 2010 until 2019 and Erica Lindbeck afterwards) - a stoic cat who is the princess of the Sol Dimension as she dislikes having help and often encounters Sonic.

Introduced in Armageddon

 * Silver the Hedgehog (voiced by Quinton Flynn from 2010 until 2019 and Bryce Papenbrook afterwards) - a chill yet determined hedgehog from a future ravaged by Solaris who went back in time to stop the calamity, originally blaming Shadow for it.

Introduced in Boom

 * Sticks the Badger (voiced by Nika Futterman) - a paranoid badger who believes in multiple conspiracy theories as she becomes a quick friend to Sonic.

Introduced in Forces

 * Whisper the Wolf (voiced by Cristina Vee) - a shy noble mercenary who used to be Infinite's partner before betraying him after learning they were working for Eggman as she joins the Resistance with her Wispon, mainly to redeem herself for her past mistakes.

Pre-Adventure

 * The Chaotix, consisting of:
 * Vector the Crocodile (voiced by Keith Silverstein since 2010) - a goofy and money-loving crocodile who leads the Chaotix as, despite his greed, he really cares for people.
 * Espio the Chameleon (voiced by Troy Baker from 2010 until 2014 and Matthew Mercer afterwards) - TBD
 * Charmy Bee (voiced by Colleen O'Shaughnessey since 2010) - TBD

Introduced in Adventure

 * Big the Cat (voiced by Kyle Hebert since 2010) - a happy go-lucky cat who loves fishing and his best friend Froggy, often not noticing evil schemes.
 * Froggy - a cute little frog who is Big's pet as he occasionally gets lost.

Introduced in Adventure 2

 * Rouge the Bat (voiced by Karen Strassman since 2010) - a seductive bat who is a professional jewel thief as she has both a rivalry against Knuckles and a friendship with Shadow.

Introduced in Advance 2

 * Cream the Rabbit (voiced by Michelle Ruff since 2010) - a friendly and Chao-loving rabbit who is best friends with Tails as she loves exploring and making friends.
 * Cheese the Chao - a cute little Chao who is Cream's best friend as he loves to follow her.
 * Vanilla the Rabbit (also voiced by Michelle Ruff since 2010) - TBD

Introduced in Heroes

 * E-123 Omega (voiced by Vic Mignogna from 2010 until 2019 and Aaron LaPlante afterwards) - an emotionless robot who is the latest E-Series model as he soon betrays Eggman after learning that he is evil, befriending Shadow and Rouge.

Introduced in Armageddon

 * Princess Elise III (voiced by Lacey Chabert) - the noble heiress to the throne of Soleanna whose kingdom is under attack by both Iblis and Mephiles as she recruits both Sonic and Shadow to help save her kingdom.

Introduced in Rush Adventure

 * Marine the Raccoon (also voiced by Colleen O'Shaughnessey since 2010) - Blaze's loyal but rather quirky best friend who wants to be a sailor, quite enjoying the thrill of sailing.

Introduced in Unleashed

 * Light Gaia/Chip - a goofy yet amnesiac chipmunk who is the reincarnation of the entity known as Light Gaia, aiding Sonic in his quest to stop Eggmanland from being formed.
 * Professor Dillon Pickle (voiced by Patrick Seitz since 2010) - an aging professor who has been studying various things, becoming Sonic's ally during the werehog crisis.

Introduced in Chronicles: The Dark Brotherhood

 * Shade the Echidna (also voiced by Michelle Ruff since 2010) - an insecure former Nocturnus Clan soldier who was initially against Sonic and his gang before breaking free as she decides to help Knuckles guard the Master Emerald.

Introduced in Generations

 * Sonic the Hedgehog (Classic) (voiced by Jaleel White) - Sonic's way more immature past self who gets warped to the present as he works with his present self to return to the past.

Introduced in Rise of the Zeti

 * Dust the Bunny (voiced by TBD) - a skilled rabbit archaeologist who has been studying the Zeti as she works with Sonic to rebanish the Zeti.

Pre-Adventure

 * Dr. Ivo "Eggman" Robotnik (voiced by Mike Pollock since 2003) - a hammy yet dangerous mad scientist who wants to take over all of Mobius, often clashing against Sonic.
 * Metal Sonic - a dangerous and psychopathic android created to be a dark doppelgänger of Sonic as he grows obsessed with beating him.

Introduced in Adventure

 * Chaos (non-speaking) - an ancient entity who grew mad after his tomb was invaded by the Echidna Clan as he gets resurrected by Eggman and begins a rampage across Mobius.

Introduced in Shadow the Hedgehog

 * Dr. Isla Orchid - a megalomaniacal scientist who has ties with Gerald Robotnik as she learns of Shadow's existence and wants to use him to create an army of ultimate life forms to replace what she sees as inferior life.

Introduced in Rush

 * Dr. Ivo "Eggman" Robotnik Nega (also voiced by Mike Pollock) - Eggman's more maniacal and dangerous Sol Dimension counterpart who is Blaze's arch-enemy as he forms an alliance with Eggman to defeat both her and Sonic.

Introduced in Riders

 * The Babylon Rogues, consisting of:
 * Jet the Hawk (voiced by Michael Yurchak since 2010) - a cocky and egotistical hawk who claims to descend from a race known as the Babylonians as he leads a gang of thieves and gains a rivalry with Sonic.
 * Wave the Swallow (voiced by Kate Higgins since 2010) - TBD
 * Storm the Albatross (also voiced by Travis Willingham since 2010) - TBD

Introduced in Armageddon

 * Mephiles the Dark - a sadistic Dark God who is one of the two halves of the being of destruction known as Solaris as he wants to merge with Iblis to bring forth the end of days.
 * Iblis - a mindless rampaging beast that is always on fire as it is half of Solaris as it wants to merge with Mephiles to form Solaris.

Introduced in Rivals

 * Lady Madonna (voiced by TBD since 2010) - TBD

Introduced in Unleashed

 * Dark Gaia - an ancient dark god who represents all evil in Mobius as he was reawakened by Eggman and the entity responsible for creating the Werehog.

Introduced in Forces

 * Infinite the Jackal (voiced by Liam O'Brien) - a terrifying yet cocky mercenary who fused with an ancient device known as the Phantom Ruby as he forms an alliance with Eggman, being obsessed with power and with destroying who he blames for his power, Whisper.

Introduced in Frontiers

 * Sage (voiced by Ryan Bartley) - a stoic artificial intelligence who was created by Eggman to be his daughter as she ends up being the protector of the Starfall Islands.
 * The End (also voiced by Mike Pollock and Cindy Robinson) - an ancient dark entity who was banished inside of the Starfall Islands as they want to break free and doom the world.