Stuffed Sonic

 is a Japanese-American adventure video game series, serving as a spin-off to the  series, being developed by Sonic Team and published by Sega since April 23rd, 2011.

Synopsis
Set in a world where every character are stuffed animals, Sonic explores Mobius and combats threats.

Games

 * 1)  (video game) (2011)
 * 2)  Stuffenstein Strikes (2013)
 * 3)  Looming Darkness (2016)
 * 4)  Two Worlds (2018)
 * 5)  Into the Lost World (2020)

Main

 * Sonic the Hedgehog (voiced by Jason Marsden) - a friendly and adventurous blue hedgehog with superhuman speed who is out to protect his world from villainous threats.

Supporting

 * Miles "Tails" Prower (voiced by Grey Griffin) - an intelligent twin-tailed fox who is Sonic's best friend and helps him by providing useful gadgets on his journey, even if, much to his annoyance, they often malfunction or backfire at him.
 * Knuckles the Echidna (voiced by Charlie Schlatter) - a stoic and TBD echidna who guards the Master Emerald as he occasionally joins him on adventures.
 * Amy Rose (voiced by Jessica DiCicco) - a TBD female hedgehog who is Sonic's closest female friend as she wields a mallet that allows her to smash any king of obstacle while trying to gain confidence to ask him out.
 * Cream the Rabbit (voiced by Tara Strong) - TBD
 * Cheese the Chao (vocal effects by Tara Strong) - TBD
 * The Chaotix, consisting of:
 * Vector the Crocodile (voiced by Townsend Coleman) - TBD
 * Espio the Chameleon (voiced by Dante Basco) - TBD
 * Charmy Bee (also voiced by Grey Griffin) - TBD
 * Big the Cat (voiced by John DiMaggio) - TBD
 * Vanilla the Rabbit (voiced by Jennifer Hale) - TBD
 * Shadow the Hedgehog (voiced by David Faustino) - TBD
 * Rouge the Bat (voiced by Olivia Olson) - TBD
 * E-123 Omega (voiced by Jim Meskimen) - TBD
 * Silver the Hedgehog (voiced by Jack DeSena) - TBD
 * Blaze the Cat (voiced by Jessica McKenna) - TBD
 * Marine the Raccoon (voiced by Ashley Johnson) - TBD
 * Tikal the Echidna (voiced by Alanna Ubach) - a TBD female echidna who guards TBD.
 * TBD

Antagonists

 * Dr. Ivo "Eggman" Robotnik (voiced by Nolan North) - a vicious mad scientist who created an army of robots on his quest to take over Mobius as TBD.
 * Orbot and Cubot (voiced by Rodger Bumpass and Richard Steven Horvitz, respectively) - TBD
 * Metal Sonic (also voiced by Jason Marsden) - a robotic doppelgänger of Sonic created by Eggman to outmatch him, gaining self-consciousness and becoming obsessed to replace him as the one and only Sonic.
 * Stuffenstein (voiced by David Sobolov) - a giant monster made out of various stuffed Mobians as he wants to conquer Mobius.
 * Black Doom (voiced by Tom Kane) - TBD
 * Captain Whisker (voiced by Mark Hamill) - TBD
 * The Deadly Six, consisting of:
 * Zavok (voiced by Dave Boat) - TBD
 * Zazz (voiced by Jason Spisak) - TBD
 * Zeena (voiced by Kari Wahlgren) - TBD
 * Master Zik (voiced by Keone Young) - TBD
 * Zomom (voiced by Kevin Michael Richardson) - TBD
 * Zor (voiced by Josh Keaton) - TBD
 * TBD

Recurring enemies

 * Moto Bug - TBD
 * Eggrobo - TBD
 * Egg Pawn - TBD
 * [some other iconic sonic enemies] - TBD

Gameplay
The games play as puzzle games as you play as Sonic and solve several puzzles in various worlds. Each world gives you a Chaos Emerald that serves as a tool to help with several puzzles with each having different abilities. Bosses also take a puzzle-like route as you have to use the world's Chaos Emerald and prior Chaos Emeralds to beat it and use it to solve puzzles embedded into the boss. Sonic is capable to defeat enemies by either jumping on them, using the Chaos Emeralds or using the environment.

Items

 * Rings - a common currency that can be used to buy various things in the shop.
 * Red Star Rings - a premium form of Rings which are more valuable than rings.
 * Health Add-Ons - potions which Sonic can find hidden in levels as when he drinks them, he gets an additional heart.
 * Chaos Drives - miniature devices spread across levels which can be used to help raise Chao in the Chao Garden.
 * Fruits - a delicious delicacy which can be bought in the shop as it can be used to also help nurture Chaos.

Introduced in the first game

 * Gravity Emerald - a Chaos Emerald that allows Sonic to manipulate gravity around him to move obstacles and enemies up.
 * Flight Emerald - a Chaos Emerald that allows Sonic to float up to the sky, allowing him to reach items and areas he can't reach.
 * Water Emerald - a Chaos Emerald that allows Sonic to breath under water.
 * Telekinesis Emerald - a Chaos Emerald that allows Sonic to move objects and enemies anywhere, being considered to be a more powerful Gravity Emerald.
 * Invisibility Emerald - a Chaos Emerald that allows Sonic to turn invisible and avoid being detected.
 * Shrink Emerald - a Chaos Emerald that allows Sonic to shrink down to a miniature size, allowing him to go to places he normally can't go.
 * TBD Emerald - TBD

Trivia

 * To differentiate it from the Prime series, the characters have a chibi look that resembles their pre-Adventure designs in size while still designed to resemble their modern counterparts, facial features and clothing included, and different voices in order to make them distinct from their Prime ones.