It has always been a little weird that Sonic has needed to append “the Hedgehog” to his name. It’s very much adding information that asks more questions than immediately needed answering. Now we know the actual reason why Sonic has been so insistent on insisting he is a hedgehog: because he’s actually a demon.
At least, that’s the answer we’re getting from Shin Megami Tensei: Liberation Dx2, a mobile RPG from Atlus and Sega. Liberation Dx2 follows the same basic idea as the main series wherein players summon and battle with demons as their partners. The game itself has had collaborations with various other series like Devil May Cry and Bayonetta, but those games at least have demons as either protagonists or major characters. So when Sonic the Hedgehog comes knocking, you have to ask yourself a few lore-defining questions here.
The Liberation Dx2 website has a special page for the new Sonic event that lets players summon the speed demon, so to speak, as part of a 30th anniversary celebration. You can only convince Sonic to join your party through talking him into it or fusing other demons into him. He does have an entry in the game’s Demonic Compendium however.
I’m hoping against hope that Sonic is also for some reason in Shin Megami Tensei V, but I don’t think we’ll be that lucky.