Here are some books highly recommended by Kate DiCamillo and your peers!
The Wild Robot by Peter Brown
The Thank You Book by Mo Willems
Elephant & Piggie by Mo Willems 
From the Mixed-Up Files of Mrs. Basil E. Frankweiler by E.L. Konisburg
Pippi Longstocking by Astrid Lindgren
Charlotte's Web by E.B. White
Raymie Nightingale by Kate DiCamillo 
The Miraculous Journey of Edward Tulane by Kate DiCamillo
The Waterfire Saga Books by Jennifer Donnelly
Fablehaven by Brandon Mull
Hero by Mike Lupica
Counting by 7s by Holly Goldberg Sloan
Percy Jackson series by Rick Riordan
Huckleberry Finn by Mark Twain
Wonder by R.J. Palacio
The Unwanteds by Lisa McMann
The Secret Hum of a Daisy by Tracy Holczer
I Am Malala by Malala Yousafzai
Out of My Mind by Sharon Draper
Inside Out and Back Again by Thanhha Lai
When You Reach Me by Rebecca Stead