Ender Wiggin: A young boy who is accepted into Battle School and becomes a fearsome fleet commander. A "Third". Peter Wiggin: Ender's older brother. Ender always feared Peter because Peter constantly threatened to kill Ender, even though Peter always assured Ender afterward that it was a joke. Valentine Wiggin: Ender's sister. Tried to protect Ender from Peter. Ender very rarely saw her or Peter after he went to battle school. Bernard: One of Ender's first enemies at the battle school. Colonel Graff: Ender's first teacher at the battle school. Formed a friendship with Ender. Alai: One of Ender's first friends at the Battle school. Was also a friend of Bernard.