Nardole (Shadow World)

Nardole existed as virtual construct in a world created by the Monks, so that they could plan the perfect invasion of Earth.

Nardole shared the history and personality of his non-virtual counterpart, only parting with that history shortly after the events aboard Chasm Forge. He was a perfect duplicate and, like the rest of the people living within the Shadow World, he believed himself to be real.

When he went beyond the light of the projection, he disappeared out of the Shadow World. (TV: Extremis)