Quoth Wikipedia: "Sir Didymus is the tetartagonist from Jim Henson's 1986 film Labyrinth. He is the last companion Sarah meets. Sir Didymus is a fox with an eyepatch and talks like a knight."

I'm an uncultured swine who's never watched Pan's Labyrinth and the bio has long since been deleted for the RPG version of this character, so I can only offer a giant shrug.

NOTE: Written by another author on insanejournal back in 2010. Not written by me, but used to preserve old writing in a better format.