Daniel and Marty
Two elderly figures Duncan sees, who speak to each other in the final scene.
Observers who have become independent
Their conversation connects them with Face Dancers who have become independent of their Masters and accumulate others' personalities. Duncan's escape evades their net. The first six novels do not definitively explain all their aims and history.
Sources
- Chapterhouse: Dune ↗Frank Herbert · PDF
The character’s events within the novels