Peter Capaldi (The Girl Who Loved Doctor Who)

Peter Capaldi was an actor in London. The Doctor once saved him from a Mandrel, and considered that he would have "made a great [him]".

After slipping into a parallel universe where the Doctor's life was a TV show called Doctor Who, the Eleventh Doctor met Matt Smith, and asked Matt to suggest that universe's Peter Capaldi as Matt's replacement to Steven. (COMIC: The Girl Who Loved Doctor Who)

Behind the scenes
The real Peter Capaldi later played the Twelfth Doctor, taking over from Matt Smith's Eleventh Doctor.