The Misfits by James Howe
In 2001, James Howe published The Misfits, the story of four outcast seventh-graders who try to end name-calling in their school. The book was instantly beloved by kids, teachers, and librarians, and it inspired the national movement known as No Name-Calling Week, sponsored by GLSEN (The Gay, Lesbian & Straight Education Network).
Totally Joe and Addie on the Inside were published as companion novels to The Misfits in 2005 and 2011, and together the series has earned multiple starred reviews and a Junior Library Guild selection.
The final companion novel to The Misfits, Also Known As Elvis, was published in 2014!