Zon

Zon (PROSE: Mindwarp) was a Time Lord that served as the Keeper of the Matrix.

He met with Anosia occasionally, as she resided within the APC Net. (PROSE: Interstitial Insecurity)

He was present during the Sixth Doctor's trial onboard Space Station Zenobia, at the end of which his identity was stolen by the Valeyard, though Zon's fate is unknown. (TV: The Ultimate Foe)