Bog

Bog is a never-seen but often heard voice of snark in the service of The Founder.

He assists Wendy Shepard as they work to protect the Founder at Calliope. We know that he appears to be made of small moving metallic particles, because he leaves traces behind. Jason Crawford figured out Bog's presence from Maintenance reports--and his predecessor had described Bog in writing.

Bog lives in the vents where he can observe all the goings-on. Normally he only talks to Wendy. Whisper the Cheshire Cat knows he's there, and of course Jason Crawford.

He likes coffees (with a drinking straw) and for some reason, is thrilled to get a necktie for Christmas because nobody remembers he actually has a neck.

This, of course, begs for further illumination.