Ultra Instinct Shaggy is an Ultra Instinct Remix featuring the character Shaggy from Scooby-Doo undergoing the “ultra instinct” transformation of Goku from Dragon Ball Super. After an Ultra Instinct Remix featuring Shaggy grew popular, the character developed a fandom online.
On October 12th, 2017, YouTuber Midya posted an Ultra Instinct Remix featuring Shaggy fighting a gang of thugs from the 2011 film Scooby-Doo! Legend of the Phantosaur, featuring the song “Ultimate Battle” from the Dragon Ball Super soundtrack playing in the background (shown below).
After the video was posted, the character inspired fan art and further video edits. On November 3rd, 2017, DeviantArtist MielSibel10032002 uploaded fan art of the character (shown below, left). Later that month, it was posted to /r/TwoBestFriendsPlay where it gained 643 points. On January 13th, 2018, Tumblr user mgx0 posted several frames of Dragon Ball with Ultra Instinct Shaggy, gaining over 35,000 notes (shown below, right).
On YouTube, popular edits featuring the character included an upload by Joe Capo that gained over 330,000 views. The video has since been removed. An edit which put Ultra Instinct Shaggy in a mod for the game Dragon Ball XV 2 uploaded by GOWBuuzer gained over 358,000 views (shown below).