I'm probably biased as the document submitter, but this was probably one of the single funniest goddamned episodes ever.
A few things included in the doc that were not used in the episode:
Bevel Lemelisk, the guy who built EVERY weapon of mass destruction in the Star Wars universe.
Callista Ming, Luke Skywalker's love interest in multiple novels who was the ghost of a dead Jedi. Luke repeatedly made out with her while she was possessing the body of one of Luke's dead apprentices.
Waru, a giant, inter-dimensional pile of meat covered in gold plates that ate Jedi
The Yuuzhan Vong, an race of extra-galactic sado-masochists who only used organic technology and killed over 300 trillion when they tried to invade the Star Wars galaxy
That snow monster that tried to eat Luke at the start of The Empire Strikes Back, who later rallied an army of other snow monsters to kill Luke Skywalker when he briefly returned to Planet Hoth in the novel Darksaber
Some stuff I came across but didn't include in the document because it was too inside baseball for the podcast:
BoShek, aka "That dumpy guy Obi Wan talked to in the background of the Cantina", who is revealed in the novels to be a better smuggler than Han Solo and also secretly a Jedi and just generally the raddest most awesome character ever, MOM!
IG-88, one of the bounty hunters who shows up in the background of a single scene in The Empire Strikes Back. A short story about him reveals he secretly uploaded his brain into the Second Death Star before Return of the Jedi and was about to secretly conquer the universe before said Death Star got blown up.
C-3PX, an evil C-3PO that shoots people.
Triclops, the Emperor's secret, evil, mutant son with three eyes who is not to be mistaken for
Trioculus, who was a different mutant with three eyes who pretended to be the Emperor's secret, evil, mutant son with three eyes.
The Abominor, a race of immortal robot monsters from another galaxy who made the Yuuzhan Vong afraid of technology. The first appearance of a member of their species in Star Wars media was
The Great Heep, a giant pile of garbage that ate robots who appeared in a 1980s cartoon special starring C-3PO and R2-D2.
And
Jaxxon, an anthropomorphic green rabbit who hung out with Han Solo and bore a weird resemblance to cartoon character
Bucky O'Hare. Note that this was one of the characters Disney decided to make part of the
canon Star Wars universe.