What models of moral and ethical behavior do the characters offer to us that we might adopt, modify, or reject in our own lives?

Ender is chosen to be the commander who leads the fleet to victory, thereby saving the world. The principle here is that a single mind can direct the war effort better than a number of individual commanders. The military leaders have decided to follow this principle as they have sought the one most promising child to become the supreme commander. But Ender does not really want to be such a savior, and he prefers to have squadron leaders who can think and act independently with just a few organizing principles to follow. In fact, Ender's decentralized approach proves superior to that of the buggers, which is centralized in that a queen commander makes all the decisions while the workers simply follow orders.