Sonic the Hedgehulk is a fictional character created by Surround Productions. He is genetically enhanced version of Sonic the Hedgehog similar to The Werehog from Sonic Unleashed. He will appear in the upcoming The Incredible Hedgehulk.
Early/Original Stories before Fanfiction
He made his debut in The Incredible Hedgehulk as the titular character. Sonic gains this power after a lab explosion caused by Dr. Eggman/Dr. Robotnik. In the story, Sonic does not like his curse (worse than the werehog he mentions). He is seen in depression through most of the story.
His early stories spawned 6 sequels.
His first original villain was Cletus "The Hedgehog" Kassidy, an obvious cameo by Cletus Kassidy/Carnage from Marvel Comics Spider-Man. This villain was initially scraped for reasons, and replaced with a vampire named Strangrel. In it's original sequel which was a cross between Sonic, Batman and The Nightmare Before Christmas, Jack Skellington was the main antagonist along with Bane, Scarecrow, Harley Quinn and The Joker. The next 2 sequels were crosses with Friday the 13th and A Nightmare on Elm Street, with Freddy Krueger and Jason Vorhees as the main villains. The next one was to originally feature Jigsaw from the Saw series, but it was scrapes because of extremely gory content. The replacement would be Michael Myers. The last 2 featured original villians such as Son-X and a returning Strangrel.