The Five

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

Life
According to the Four, he lost so many braincells when he regenerated into the Five that he had to stop wearing shoelaces. (AUDIO: Dark Universe)

Post-mortem
On Syra, the Five shouted "echo!" and broke the Sonomancer's concentration as she was meditating. (AUDIO: The Sonomancer)

The Five commented on Volstrom's new nose shortly after her regeneration. (AUDIO: The Side of the Angels) The Five boasted he was a formidable opponent who was capable of killing everyone even when he was incarcerated within the Eleven when he had been caught by the Time Lords. The Eleven rebuked him for giving the game away. (AUDIO: Stop the Clock)

Behind the scenes

 * The script of Dark Universe describes the Five as a "wise-cracking and confident trickster. The joker in the pack".