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 body was taken over by the Valeyard. (TV: The Ultimate Foe)