Characters in Shadow of the Sith

Luke Skywalker

Also in Star Wars Episode V - The Empire Strikes Back, Star Wars Episode VI - The Return of the Jedi, Star Wars Episode VII - The Force Awakens, Star Wars - Empire Strikes Back - From a Certain Point of View, Star Wars - Heir to the Jedi

Lando Calrissian

Also in Star Wars - From a Certain Point of View

Ochi of Bestoon

Emperor Palpatine

Also in Star Wars Episode III - Revenge of the Sith, Star Wars Episode VII - The Force Awakens, Star Wars Episode IX - The Rise of Skywalker, From a Certain Point of View, Star Wars - Lords of the Sith, Star Wars - Queen's Hope, Star Wars - Tarkin, Thrawn, Thrawn: Alliances

Rey

Also in Star Wars: The Last Jedi, Star Wars Episode IX - The Rise of Skywalker

Darth Sidious