My Friend Slappy (Goosebumps Slappyworld #12)

"Barton Suggs has it rough. He only has one friend, Lizzie Hellman. The school bullies are out to get him--and nobody believes him about it. After Barton gets pranked again, he's had enough. So when Barton brings Slappy to life, he's thrilled to find a new friend that's willing to help him get revenge on the bullies"--Publisher marketing.