a demon who looked up to Sonic during the events of the Classic Sonic Games (1, CD, 2, 3&K), who eventually modeled their entire existence off of the lovable blue blur, taking the name of Speed Demon, in memory of his hero

Eventually, during Sonic Adventure 2, before the time Sonic and Shadow first face off, he steps in Sonic’s way, proposing a deal. Speed, for Strength. Sonic accepted, the fight going alot smoother than expected for Sonic, due to the deal.

Years later, skipping to frontiers, Sonic finds that he has ZERO control of his powers now, and misses the feeling of wind in his quills. He summons SD, and the trade is made once more.

But something is off. Sonic is as fast as he used to, yes, but theres something wrong. He’s beginning to notice that hes too cocky. Too brash. He cant help but get hurt in fights, even if they have the chance of being lethal.

Eventually, SD reveals that HE is the one who did this. Hes the reason things are going downhill. So a brawl commences, leading to the events of first song, “Speed Deal”. SD, having learned all of Sonic’s moves, is able to copy the hedgehog, eventually bringing him to his knees.

A sickening crack rips through the air as SD reveals his true form, quills falling away, jusy to come back in shades of green and yellow, and much longer. He soon took the form of Knuckles, with a familiar color pallet. Ashura. With a single punch, Sonic is blown to bits before he can move, and SD walks off, feeling complete. He can do what hes always wanted to do.

After the brawl, and Frontiers, SD, now taking Sonic’s form, goes back to Mobius, and lives out his life as the titular hedgehog. He takes it all. His friends, his adventures, everything. Until..he gets bored. He gets bored of it all. So he decides, instead of being the hero, he comes the villain.

Carnage insues, mobians being murdered int the night, left and right. Knuckles is the of the Freedom fighters to fall, followed by Amy, and Tails. SD looks over it all, content with himself. He looks at the now bound souls he has in his possession, and leaves. He leaves this world, and moves onto the next, erasing each one after wrecking carnage across it.