Rhyssa Graf was the wife of cartographer Auric Graf, and together they explored Wild Space. Rhyssa had two children, Lina and Milo, who affectionately referred to her as "Mum." While exploring an uncharted swampworld, Rhyssa and Auric were arrested by Captain Visler Korda of the Galactic Empire, leaving the children alone on the planet.
- Adventures in Wild Space: The Escape (First appearance)
- Adventures in Wild Space: The Snare (Mentioned only)
- Adventures in Wild Space: The Steal (Mentioned only)