Star Trek - Sand and StarsA. C. Crispin, Diane DuaneStar Trek: Myriad Universes, book 3

Characters in Star Trek - Sand and Stars

8 characters, main characters first.

Main characters

Mr. Spock
Also in Harlan Ellison's The city on the edge of forever (teleplay), Star Trek, Star Trek Adventures - Trek to Madworld, Star Trek: Strange New Worlds: The High Country, Star Trek - The Eugenics Wars - The Rise and Fall of Khan Noonien Singh, Star Trek - The Prometheus Design, Star Trek - Vulcan's Soul - Exodus, I Am Spock, Imzadi, Killing Time

Antagonists

Romulans
Klingons
Also in Star Trek Adventures - Trek to Madworld, Star Trek Vanguard - Summon the Thunder
Freelans

Supporting characters

Sarek
Also in Avenger, Star Trek - Unspoken Truth, Sarek
Captain Kirk
Also in Harlan Ellison's The city on the edge of forever (teleplay), Star Trek Voyager - Mosaic, The Abode of Life, Star Trek 8
Surak
Also in Star Trek - Vulcan's Soul - Exodus
Amanda