If you like Captain Underpants, you might like…

Erickson, John R.      Hank the Cow Dog (series)

Sachar, Louis            Sideways Stories from Wayside School (series)

Cowell, Cressida         How to Train Your Dragon

Crilley, Mark             Akiko books (esp. the graphic novels)

Dahl, Roald              The Twits

Dadey, Debbie         The Bailey School Kids (series)

Elliott, David            The transmogrification of Roscoe Wizzle

Evans, Douglas         The Elevator Family

Fleischman, Sid        The McBroom series

Greenburg, J.C.         Andrew Lost on the Dog

Howe, James              Bunnicula 

King-Smith, Dick      Three Terrible Trins (and other books)

Manes, Stephen       Be a Perfect Person in Just Three Days!

MacDonald, Betty     Mrs. Piggle-Wiggle series

Pennypacker, Sara    Stuart’s Cape

Pinkwater, Daniel     The Blue Moose                             The Werewolf Club

Proimos, James         Johnny Mutton books

Quindlen, Anna        Happily Ever After

Rockwell, Thomas    How to Eat Fried Worms

Sachar, Louis            Sideways Stories from Wayside School (series)

Scieszka, Jon            The Timewarp Trio (series)

Wisniewski, David        The Secret Knowledge of Grown-ups

Other possibilities (slightly harder reading level)

Lindgren, Astrid       Pippi Longstocking series

Pullman, Philip         I Was a Rat!

Guathier, Gail          My Life Among the Aliens

                                Club Earth

Snicket, Lemony       A Series of Unfortunate Events (series)

Fitzgerald, John D.   The Great Brain (series)