Medium Dave
Background
Dave "Medium Dave", "Davey" Lillywhite is a thief in Ankh-Morpork, on Discworld. His brother is Banjo and his mother was Ma Lillywhite.
During the events of Terry Pratchett's Hogfather (2006) played by Peter Guinness
Teatime has a meeting with Medium Dave, Banjo, Chickenwire and Mr Sideney. Mr Brown shows up at the meeting and Teatime punches Banjo in the mouth, knocking out one of his teeth. As Violet collects Banjo's tooth she is grabbed, while Teatime hijacks Ernie's carriage. Banjo carries Violet and puts her in Ernie's carriage and the others get inside. Banjo reminds Medium Dave that their mom told them not to hit girls. Teatime then tells Ernie to drive to the Unseen University.
Ernie drives the carriage to a wall behind the Unseen University and Teatime takes some magic powder that Ernie has and throws it at the wall and a portal forms. Teatime then kills Ernie and drives the carriage through the portal. Teatime and the others walk into the Tooth Fairy's castle and some Toothguards stick their heads out from behind pillars and look at them. The Toothguards are then killed by Medium Dave and Chickenwire. Teatime tells Chickenwire and Medium Dave to pile all the teeth into a pile and tells Mr Brown to unlock every door in the castle. Medium Dave and Chickenwire finish gathering all of the teeth and Mr Sideney starts to cast his spell. As Medium Dave and Chickenwire are planning to leave with property deeds they found, Teatime stops them and tells Medium Dave, he controls Banjo now. After Teatime captures Susan An argument breaks out when Medium Dave wants to leave and Teatime tells Banjo to grab Susan. A spectral image of Ma Lillywhite appears and accuses Banjo of being bad and Medium Dave of letting Banjo get into trouble. Medium Dave dies of fright.