Unwin is a squire at King Gregor's court at Dunwyn Castle, under Sir Tuxford. He is portrayed as a bully toward Cavin, but he is shown to be cowardly whenever he runs away in fear of the Ogres, or during a trial in which he has to face the Mysterious Knight. In contrast to Cavin, he is also known to be a non-believer in Gummi Bears.
He appears in only nine episodes, including the pilot episode "A New Beginning", which was his debut appearance. The others are:
- "Someday My Prints Will Come"
- "When You Wish Upon a Stone"
- "A-Hunting We Will Go"
- "Light Makes Right"
- "Over the River and Through the Trolls"
- "Up, Up, and Away"
- "He Who Laughs Last"
- "Girl's Knight Out"