I'm getting back into Sonic.EXE shit and it's Outcome Memories' fault (worth it ngl)
Basically this guy's name is EXE, but not like the file kind like other versions of spooky Sonic, instead it stands for Executioner, flipping the "EXE" idea on its head. He also goes by the joke name of "2011eggs" (the original exe is called "2011x" and I'm the egg guy, get it??? I'm so silly!!)
His lore is based on the original Sonic.EXE lore, but has a special spin on it to make him more original.
So this guy comes from a place that's a kind of higher plane of existence, where god-like beings live. Executioner (this wasn't his name at the time, he didn't have one) was a child who killed an elder "god" in a fit, and was banished to a void in-between dimensions, he managed to peer into another reality from this void, and became intrigued by humans and their creations, he found himself especially enamored with a certain blue mascot, and he became obsessed with this piece of entertainment people had crafted. Because of his obsession, he formed his own world as a recreation of this fictional world and made it a reality. This world is a replica of Sonics world, and it contains recreations of the Sonic cast, even holding the memories and minds of the characters. The notable exception is Sonic, as Executioner tried to become the Sonic of this world, of course it failed as the characters clearly saw through his poor imitation, this threw him into a fit, where he would take it out on the characters. In the hypothetical best ending of an also hypothetical game, the characters end up actually working together to overpower him with the help of the Chaos Emeralds, and banish him back to the void, enraging Executioner due to the fact that he was bested by his own creations. Of course, with his power, he restarts in another reality and repeats the process.
Ask me if you wanna know anything else about him!