The five categories below represent the prevailing literary elements in the Diary of a Wimpy Kid series.  Search within each category to find more books that interest may you.   Most of these are a series.  I have either noted an individual book or series, but have the first book in the series on the annotated bibliography.

Diary

Dork Diaries #1: Tales from a Not-So-Fabulous Life
Dear Dumb Dairy #1: Let's Pretend This Never Happened
Lifewriting (Fred White)

_Humor

Adventures of Captain Underpants
The Adventures of Ook and Gluk
Time Warp Trio 1 - Knights of the kitchen table

_Middle school

Big Nate Series
Wayside School Series
Middle School Survival Series
Okay for Now

_Family

_Superfudge
Knucklehead

_Friendship

Runaway Ralph
The Report Card
Dragonbreath Series
Cowboy and the Octopus