Famous INTJs

Real People

• Nathanial Bowditch - Mathemetician, navigator, and ship's captain.

Fictional People

Science Fiction

• Susan Calvin - A robot psychologist from Isaac Asimov's stories.
• Soundwave - A completely blank-faced Decepticon from the series Transformers (as seen in the 1984 show).
• 7 of 9 - A former Borg slowly relearning what it means to be human.  Also from the show Star Trek: Voyager.
• Koji - Leader of a trio of boys trying to stop the rise of a new world order by going back in time to change events.  (From the TV show Generator Gawl)

Classics

• Athos - The leader of the three Musketeers.
• Van Helsing - The grey-haired professor who led the group that killed Dracula in Bram Stoker's original novel.
• Mr. St. John - The clergyman who seeks the Jane Eyre's hand in marriage so that she can serve as a companion on his missionary journey to India.  (From the book Jane Eyre)

Detectives and Their Bête Noires

• Jupiter Jones - Leader of a team of boy detectives from the book series The Three Investigators.
• Adrian Monk - Obsessive compulsive detective.
• Hercule Poirot - Detective from the famous Agatha Christie series, also with a few obsessive compulsive traits. 
• Professor Moriarty - The infamous arch-rival of Sherlock Holmes.
• Mordecai - Ice-blooded (and obsessive compulsive) feline hitman from the webcomic Lackadaisy.