The Doctor (Doctor Who)
The Doctor is a Time Lord and titular character from the Doctor Who universe.
Attributes
As a Time Lord, the Doctor has an unnaturally long life expectancy. He can also "regenerate" when near death, a process that heals all his injuries, but also changes his appearance and often causes a period of disorientation. He has already regenerated ten times, however, and Time Lords are typically limited to twelve regenerations.
The Doctor has a genius-level intellect and possesses detailed knowledge of multiple scientific and technological fields. He is also well-traveled and able to fend for himself on nearly any civilized planet.
He is known to have trained in a few obscure alien martial arts, including "Venusian aikido" and "Martian karate". These are primarily associated with the third incarnation of the Doctor; his subsequent regenerations have apparently not kept in practice.
Paraphernalia
The Doctor possesses a TARDIS that enables him to travel through time and space. Its chameleon circuit is broken, leaving it stuck with the outward appearance of a 20th-century British police call box.
The Doctor sometimes carries a sonic screwdriver, which can emit controlled vibrations. The device has a multitude of uses in addition to tightening and loosening screws.
The Doctor has occasionally traveled with an armed, canoid robot called K-9.
The Doctor typically has a wide array of seemingly innocuous items in his pockets, as well.