Who is Bonzo

Bonzo is Ender's first commander, in Salamander Army. He hates Ender for being young, brilliant, and talented, and because Ender has no experience in battles, Bonzo refuses to let him practice or fight with the army. Bonzo leads a group of older boys to attack Ender's practice group in the battleroom during free-time practice. When Ender is made commander and makes Bonzo's army look foolish during their battle, Bonzo corners Ender in the showers with seven large friends, intending to kill him. But Bonzo is motivated by Spanish honor, so Ender convinces him to fight one-on-one. Ender wins decisively, knocking Bonzo's nose into his brain, unintentionally killing him.