Keeps calm under the most stressful of situations.
Can BS people into believing he's a professional at something, when he's really just wingin' it.
Has had many different faces over a very long period of time.
Saved the Earth from alien invaders.
Can talk his way out of any situation with spur of the moment babble.
Can use technology he has never even seen before and get it to work at his advantage.
Has a friend/foe relationship with an egotistical, fame/fortune hungry nutjob and refuses to ditch him no matter how many times he tries to stab him in the back.
Always manages to save the day in the end.
Bugs Bunny = The Doctor
An amusing concept I thought up one night when I couldn't sleep.