What is the theme of Ender's Game? the theme needs to be more than one word
One could argue that the theme of Ender's Game is military ethics. Specifically, the breakdown of those ethics during wartime. Few things about Ender's military training can be called ethical. He's taken from his family, isolated from his peers, and manipulated by a man later tried for war crimes and child abuse. His training is passed off as a "game," subverting the innocence and simplicity of play for military means. Ender unwittingly exterminates an entire race because his trainers tell him he's merely playing a video game, not commanding military troops. He bears the guilt of this xenocide for the rest of his life.
The training school is just the mise-en-scene for the gradual maturing of Ender. The theme of the book has more to do with looking with fresh eyes at our opponents--the reason for his success in the training rooms. It is his final realization that the Buggers are not enemies, but rather a culture that has a different way of living, and his final preservation of the new Buggers colony, that reveal the theme of Card's book. As in all...
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I've linked to the themes page so you can get more ideas.
One of the themes is ambition and power. Peter manipulates the masses to influence them and bring about the situations he desires. Graff, with his power, manipulates Ender into becoming the perfect commander capable of making smart but ruthless decisions to defeat the buggers. Peter manipulates to gain power and Graff manipulates because he has power.