Read if you like Captain Underpants

(From CALIB):

Geronimo Stilton series (Piemme),
Hank Zipzer series (Winkler),
Zack Files series (Greenberg),
Hank the Cowdog (Erickson),
My Weird School series (Gutman),
Tin-Tin, Marvin Redpost series (Sachar),
Time Warp Trio series(Scieszka),
Tales from the House of Bunnicula series (Howe).