Evan Whitehead is a boy who brags that he has kissed many girls in Greg's grade. He started the chicken pox epidemic at Greg's school by turning up having that disease, and infected four boys before he was sent home by the school nurse. It was also rumored that he infected some girls. He only appeared in The Third Wheel. According to Greg, Julie Webber who is hanging out with Ed Norwell, is the only girl who he never kissed. Greg says that the Mad Pantser might have been infected with chicken pox, because there had not been any pantsing incidents since the four boys infected with chickenpox were sent home.
- He might have a Welsh or English heritage due to his name. Evan is a common Welsh name, while Whitehead is a British surname.
- It is unknown which boys he infected with chicken pox or if the rumors that he infected some girls is true.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)