Peter Capaldi (in-universe)

From Tardis Wiki, the free Doctor Who reference
You may be looking for the real Peter Capaldi.

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

After slipping into an alternate dimension where the Doctor's life was a TV show called Doctor Who, the Eleventh Doctor met Matt Smith, and asked Matt to suggest 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.