The main characters in "The Bully" by Paul Langen are Darrell Mercer and Tyray Hobbs, two students in the ninth grade at Bluford High. In this book, Darrell is bullied by Tyray because he is smaller than his classmates.
"The Bully" is part of a series of books called The Bluford Series. The series is set in Titular High School and are young adult novels written to explore issues that affect kids in high school, from bullying to peer pressure and divorce. Langan wrote some of the books in this series, but not all. "The Bully" is part of the curriculum in some English classes.