acceptance action adolescence advanced-technology adventure ai-(artificial-intelligence) alien alien-communication alien-invasion aliens ambition artificial-intelligence battle battle-room battle-school battle-simulation betrayal brotherhood bullying character-development child-prodigies child-prodigy child-protagonist child-soldiers childhood children childrens-literature chosen-one cloning colonization coming-of-age communication compassion competition complex complex-characters courage deception destiny dystopia dystopian dystopian-future dystopian-society dystopian. education empath empathy end-of-the-world ender ender-wiggin enders-game enders-siblings espionage ethical-dilemmas ethics exploration extraterrestrial-life extremism family family-dynamics fear friendship future future-dystopia future-society future-technology futuristic futuristic-setting futuristic-society futuristic-technology game game-theory games gaming genetic-engineering genetic-manipulation genetics genius genius-protagonist geniuses genocide gifted-children government government-conspiracy government-control government-manipulation hero heroism human-aggression human-empathy human-extinction human-survival humanity identity intelligence intense intergalactic-war international-relations interstellar-politics interstellar-travel interstellar-war isolation leadership loneliness loyalty manipulation military military-academy military-fiction military-school military-science-fiction military-strategy military-tactics military-training mind-control moral-ambiguity moral-dilemma moral-dilemmas morality outcast outer-space peer-pressure perseverance personal-sacrifice philosophy political-intrigue political-philosophy politics power power-dynamics power-struggle prodigious-intelligence prodigy protagonist psychological psychological-manipulation psychological-thriller psychological-warfare psychology redemption relationships sacrifice school science-fiction secrets self-discovery sibling-dynamics sibling-relationship sibling-relationships sibling-rivalry siblings social-manipulation solitude space space-academy space-battle space-battles space-colonization space-exploration space-fleet space-opera space-travel space-war space-warfare strategic-genius strategic-thinking strategy super-advanced-technology survival suspense tactical-genius talented-children teamwork technology teen-protagonist telepathy thrill training trauma trust underdog unpredictable-twist untrustworthy-adults video-game video-games video-gaming violence virtual-reality virtual-reality-games war war-games war-strategy war-tactics warfare world-building xenocide xenophobia young-adult youth