The Doctor

"I'm the Doctor, I've lived for over 2000 years.... Most of those years were good. I've made many mistakes, and it's about time I've done something about that...."

- The Doctor, Deep Breath Series 8 Episode 1.

Description
The Doctor is the Last of a mysterious race called the Gallifreyans, in which his home planet was destroyed by the Dalek Armada (The 13 Doctors did save Gallifrey eventually, but the Time Vortex erased the memory of saving it). In his home species, he was ranked as a Time Lord, having control over the Relative of Time. As the Universe rid of the Time Lords, the Doctor is the last Time Lord left in existence, making him the sole ruler of Time. The Time Lords have a special ability where when near-death experiences, they can regenerate into a new body, restoring their wounds, but it changes their overall appearance until the next regeneration.

Backstory
During his young years, The Doctor used his full name to refer to himself, but evidently chose the alias, "Doctor" to protect his identity for various safety reasons. When he was young, about 400 years old, he stole a Type 40 Tardis Module, in which the Chameleon Circuit failed, making the Tardis permanently disguise as a 1960's British Telephone Booth.

Appearance
The Doctor's twelfth reincarnation wears a black Frock Coat resting near his knees, velvet-lined insides, and underneath a black over-shirt with a white business top underneath. He wears black trousers. His facial appearance is old, The Doctor describing himself as "Menacing", as he found the eyebrows naturally angry.