He can also have true feelings for others (he asks the Beast about Snow White and her cubs, he mourns his wife's death, and he considered putting his own safety at risk to protect Gary when the Librarians captured them, and they were having a car accident).

In the series, Jack creates a film trilogy of his adventures to increase his popularity in the Mundy world, making him nigh-immortal (a theory that is still strongly disputed to this day, even by Frau Totenkinder).

It was recently revealed that Jack was not, in fact, involved in the Beanstalk or Giant-killing incidents, but is actually an unknowing copy of an older fable named Wicked John.

Upon Wicked John's death, some great power decided to write the trickster back into some later stories, but got his name wrong, thus creating Jack.

However, Mister Revise later revealed after the War with Bookburner in a retcon, that Jack was indeed the one who sold his cow for magical beans, and that he is the son of a Literal, and Prince Charming.