Sonic the Hedgehog (character)

Sonic the Hedgehog was, according to differing accounts, either the main character in the video game of the same name, (PROSE: Business Unusual, etc.) or a real individual who could run at high speeds. (WC: New Adventures Await!)

Biography
Sonic swiped a floating ring out of Gollum's grasp inside a dark cave. (WC: New Adventures Await!)

Other references
He was a blue hedgehog. (PROSE: Business Unusual)

Ace joked with Dr John Watson that whatever the Rakshassi were worshipping, it wasn't Sonic the Hedgehog. (PROSE: All-Consuming Fire)

Martha Jones once described the Tenth Doctor's hair as "very Sonic the Hedgehog", although the Doctor said he was going for more of a Sid Vicious vibe. (PROSE: Forever Autumn)

When Joel described the sonic mascara to her, Shawna Thompson asked if it was "like the hedgehog?" (AUDIO: Recruits)

Information from invalid sources
Sonic had apparently heard of the Doctor before meeting him, and was impressed when he erroneously heard that he named the sonic screwdriver after him. (GAME: LEGO Dimensions)