Nessus: Piersons puppeteer, the Hindmosts partner and mate. Led the first Ringworld expedition.

The Hindmost: Piersons puppeteer, once Chief-in-Command of his species. Led the second Ringworld expedition.

Chmeee, once Speaker-to-Animals: Kzin. First and second Ringworld expeditions.

Roxanny Gauthier: Earth born, Detective-One in the ARM. Served aboard Snail Darter and Gray Nurse.

Oliver Forrestier: Wunderland born, Detective, ARM. Served aboard Snail Darter and Gray Nurse.

Claus Raschid: Earth born, Detective-Two, ARM. Served aboard Snail Darter and Gray Nurse.

Detective-Major Schmidt: Earth born. Served aboard Gray Nurse.

Wes Carlton Wu: Earth born, Flight Captain aboard Koala.

Tanya Haynes Wu, Earth born, Purser aboard Koala.

Ringworlds children

Seeker: species unknown, last seen with Teela Brown.

Acolyte: Kzin, Chmeees exiled son.

Bram: Vampire turned protector, ruler of the Repair Center for countless aeons until killed by Tunesmith with Louis Wus help.

Wembleth: species unknown, Ringworld-born traveler.

Tunesmith: Night Person (Ghoul) turned protector.

Kazarp: Night Person, Tunesmiths son.

Hanuman: Hanging Person turned protector.

Valavirgillin: Machine People, represents Farsight Trading.

Proserpina: surviving Pak protector.