Who is Gary Hobin from Loser and what is their importance?

Gary Hobin is one of the best athletes at the elementary school. Zinkoff is on his fourth-grade team in the annual Field Day athletic derby, but in fifth grade, Hobin forbids Zinkoff to compete on the same team. In middle school, Hobin continues to scorn Zinkoff. Symbolic of the self-involved school athlete who thinks his prowess on the playing field means everything, Hobin never sees anything good in Zinkoff.