One of Greg Heffley’s main interests is playing video games. He would much rather be inside playing video games than outside playing sports or working out. Greg too often prioritizes video games over his homework and chores. He plays lots of games and claims that he would be able to beat all of his classmates in video games. One of the games he loves most is Twisted Wizard, the one that got mixed up with the Giving Tree Guy’s Christmas gift.
Greg is also interested in drawing and writing. He insists that he is not writing a journal, not a diary, which shows that he is a bit self-conscious about this interest and that it is important to him to appear cool. Regardless, his book is quite detailed in its account of his life and in the portrayal of the people around him, which shows that he puts thought and effort into his drawing and writing.
Although he is not outwardly enthusiastic about it, Greg also auditions for the school play, The Wizard of Oz. Mrs. Norton shows everyone the movie version, and Greg decides to sign up to be a tree, so he does not have to sing and so he can throw apples at Dorothy. His costume ends up not having armholes, though, so the role is not all he dreamed of. But his voluntary participation shows he was interested in the production.