Katrina Welker is a publisher in a flashback in Diary of a Wimpy Kid: The Long Haul, it is unknown what she is like, Greg had to write a note to a writer who is not Mik Davies, so he picked Nathaniel Hawthorne on March the 30th, noting that he was asked to write the letter by his teacher and that he hadn't read any of the author's books (no offense). He also asked Nathaniel Hawthorne what his favourite colour, favourite animal, favourite flavour of ice cream and favourite superhero movie was, ending with his name and a note to answer him quickly as he is getting graded. Fifty-two days later, Katrina wrote a letter back, saying "Dear Mr. Heffley, We regret to inform you that the author to whom you have written, Mr Hawthorne, passed away more than a century ago. As such, he will not be able to respond to your questions. With regrets, Katrina Welker, Publisher.