Sonic Universe react

a flash and in the middle of a huge room with a plasma TV appeared...

Villains

Jackal Infinite, Doctor Eggman (aka Ivo Robotnik), Scourge the Hedgehog, Mogul the Mammoth (PXE - because I prefer that universe. There he is Silver's mentor and repents of his past actions), Fiona the Fox, Nazo the Hedgehog, Alicia the Squirrel (Antipode Sally), Dmitri the Echidna (hesitates between his duty to the Dark Legion and becoming a hero or at least neutral), Finitevus the Echidna, Mephiles the Hedgehog, Nine (N'rrgal) and other Ancient Gods of Darkness, Xorda (Cosmic Threats) Destructix, Iblis, Mephiles the Dark, the Dark Legion, Black Doom, Metal Sonic, Orbot, Cubot, Elias Acorn and other villains from IDW, Archie Comics and games

Brotherhood of Guardians

Locke - Knuckles' father, Sabre - Locke's father and Knuckles' grandfather, Athair - Knuckles' grandfather, Thunderhawk - Janelle-Lee's father, Janelle-Lee - the first and only female Guardian in the known line, Thunderhawk's daughter, Spectre - one of the earliest known Guardians, Sojourner - follows Spectre in the lineage

Heroes

Sonic the Hedgehog (34 years old), Shadow the Hedgehog (21 forever), Silver the Hedgehog (29), Amy the Hedgehog (30), Miles "Tails" Prower (29), Sally the Squirrel (32), Knuckles the Echidna (34), Marine the Raccoon (19), Mighty the Armadillo (32), Charmy the Bee (18), Espio the Chameleon (20), Vector the Crocodile (31), Ray the Flying Squirrel (26), Julie-Su (33), Saffron (18), Blaze the Cat (30), and other characters from IDW and Archie comics based on Sonic (adults and adults)

Neutrals

Lara-La (Lara-Le) - Knuckles' mother (54), Winmacher - Knuckles' stepfather, Knuckles' stepbrother Mace (Knuckles' half-brother - 27), Chaos (Magical and ancient threats sometimes), Tikal, the Master Emerald