action adolescence advanced-technology adventure ai-(artificial-intelligence) alien alien-communication alien-invasion aliens artificial-intelligence battle battle-room battle-school betrayal brotherhood bullying child-prodigies child-prodigy child-soldiers childhood children chosen-one cloning colonization coming-of-age communication compassion competition complex complex-characters courage deception destiny dystopia dystopian dystopian-future dystopian-society dystopian. education empathy end-of-the-world ender ender-wiggin enders-game enders-siblings epic-battles espionage ethical-dilemmas ethics exploration extermination extraterrestrial-life extremism family family-dynamics fantasy fear friendship future 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 heroism hidden-agendas human-aggression human-extinction human-survival humanity identity independence intelligence intense intergalactic-war intergalactic-warfare international-relations interstellar-conflict interstellar-politics interstellar-travel interstellar-war isolation leadership loneliness loyalty manipulation military military-academy military-school military-science-fiction military-strategy military-tactics military-training mind-control mind-games moral-ambiguity moral-dilemma moral-dilemmas morality outcast outer-space peer-pressure perseverance personal-sacrifice philosophy political-intrigue political-philosophy politics power-dynamics power-struggle prejudice prodigious-intelligence prodigy protagonist psychological psychological-manipulation psychological-thriller psychological-warfare psychology redemption relationships rivalry sacrifice school science-fiction secrets self-discovery sibling-dynamics sibling-relationship sibling-relationships siblings simulation-games simulations solitude space space-academy space-battle space-battles space-colonization space-exploration space-fleet space-opera space-travel space-war space-warfare strategic strategic-genius strategic-thinking strategy survival suspense suspenseful tactical tactical-genius tactics teamwork technology teen-protagonist telepathy the-future thrill training trauma trust underdog unpredictable-twist 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