The Two

The Two was the main alias used by the second incarnation of a Renegade Time Lord who suffered from regenerative dissonance.

Post-mortem
As the Eight began to regenerate, the Two told him that he tried his best but it was time for a 'better' man to take charge. He also told the Six to be quiet, telling him that none of them get to be in charge anymore, and to concentrate during the Eight's regeneration. (AUDIO: The Doomsday Chronometer)

The Two boasted that his "nose was particularly good at sniffing out traitors." Within the Eleven, he exposed Volstrom's betrayal of Padrac as an agent of Ollistra. (AUDIO: Songs of Love)

Personality
While on a mission for the High Council with the Twelve, the Eighth Doctor described the Two as "the charmer". (AUDIO: Planet of the Ogrons)

Behind the scenes

 * The script of Dark Universe describes the Two as "calm, reasonable, convincing, charming, liar and manipulator".