Bio: An observer. By use of a chair wired with iso-temporal circuity, he was able to move his body out of synch with time by a nanosecond. The result was that he was intangible and invisible to those he observed—except, of course, Time Lords like the Eighth Doctor who are able to sense disturbances in time.
So used to observing, he refers to even himself in the third person.
He, like all observers, was controlled by Gorolith.