Note: a glossary of terms used in The Ring of Charon can be found at the end of the book.
Jansen Alter. A Martian geologist.
Sondra Berghoff. Young gravities scientist at the Gravities Research Station, Pluto.
Wolf Bernhardt. Night shift duty scientist at the Jet Propulsion Laboratory, later head of the U.N. Directorate of Spatial Investigation (DSI).
Larry O’Shawnessy Chao. Junior researcher at the Gravities Research Station, Pluto.
Chelated Noisemaker Extreme, also know as Frank Barlow. Naked Purple radio technician.
Lucian Dreyfuss. Technician at the Moon’s Orbital Traffic Control Center.
Gerald MacDougal, husband to Marcia MacDougal. Born-again Canadian exobiologist.
Marcia MacDougal, wife to Gerald MacDougal. Planetary engineer on Venus Initial Station for Operational Research (VISOR). Escaped from Naked Purple Movement in Tycho Purple Penal as a teenager.
Hiram McGillicutty. Dyspeptic staff physicist at VISOR.
Ohio Template Windbag. Maximum Windbag, or leader, of the Naked Purple Habitat (NaPurHab).
Dr. Simon Raphael. Elderly and embittered director of the Gravities Research Station, Pluto.
Mercer Sanchez. A Martian geologist.
Dianne Steiger. Pilot of the cargo tug Pack Rat. Later, captain of the Terra Nova.
Tyrone Vespasian. Director of the Moon’s Orbital Traffic Control Center.
Dr. Jane Webling. Science Director, Gravities Research Station, Pluto.
Coyote Westlake. Solo asteroid miner, owner of the mining ship Vegas Girl.