- "Nonsense. My grandchildren's grandchildren could never live long enough to repay you."
- ―Spero to Princess Leia Organa
Spero was a male Ho'Din who lived in the Southern Underground on Coruscant. His life and that of his family was saved by Leia Organa prior to 3.5 ABY. He was a Master Gardener, and created a strain of yellow fungus used over the galaxy, and also grew feather trees in his shop. He later helped Leia find the entrance to Xizor's Palace. Later Lando Calrissian and Luke Skywalker would come to him for aid, only to find him tied up in his shop. They were attacked by men from Black Sun and were rescued by Dash Rendar, though Spero was left behind with an apology.
- Shadows of the Empire novel (First appearance)
- Shadows of the Empire audio book
- Shadows of the Empire junior novelization
- The New Jedi Order: Balance Point (Mentioned only)
- Star Wars Encyclopedia
- Shadows of the Empire Sourcebook
- The Secrets of Star Wars: Shadows of the Empire
- "Filling in the Shadows"—Star Wars Galaxy Magazine 9
- Star Wars: The Art of the Brothers Hildebrandt
- Ultimate Alien Anthology
- The Complete Star Wars Encyclopedia