I Am Underdog — Anne Schraff

Kemba feels like the lamest kid in school. If only he could be cool like the computer game superhero Underdog. But he can't even save himself from the biggest bully in the sixth grade, let alone protect the weakest of the weak like Underdog does. He has zero friends. Or so he thinks. Kemba hasn't even had the courage to try until one act of cruelty pushes him over the edge.