Ghost

A Ghost that searched the ruins of Tower North after the Red War.
A Ghost who rose a deranged Guardian, and eventually left that Guardian after they went nuts.
The Ghost of Cyrell. Was abandoned by Cyrell deep in the Reef.
Tyra Karn's Ghost. Hates being called "Ghost," but hasn't come up with a better name.
A Ghost that resurrected a young child that is implied to have grown into Shin Malphur.
A Ghost who found his Guardian right as a Cabal drill landed. The Guardian immediately killed its crew and warbeasts.
A Ghost who wrote about Guardian inspiration.
A member of the spectral network that was caught and killed while exploring an Archon's Forge.