Trista

Trista is a girl and supporting character in the series who met Greg and Rowley at the end of The Last Straw. They took her to Rowley's dad's Country Club in Dog Days. In Dog Days, she went to the country club with Greg and Rowley but within five minutes, she met a life guard, hung out with him for the rest of the time, and forgot all about Greg and Rowley.

Trivia

 * There is a possibility she may like Greg, as implied in the third book, where she says "Hi!" to Greg in a very nice way.
 * Where Trista moved from which state remains unknown, though in the online book, Greg notes down that Trista came from New Mexico.
 * Trista appeared in the final sections of the online book and still says the same dialogue she had in The Last Straw.
 * In the Diary of a Wimpy Kid: The Ugly Truth, she is Greg's girlfriend.