acceptance action adolescence advanced-technology adventure ai-(artificial-intelligence) alien alien-communication alien-invasion aliens ambition artificial-intelligence battle battle-school battle-tactics betrayal brotherhood bullying child-prodigy child-protagonist child-soldiers childhood children chosen-one colonization coming-of-age communication compassion competition complex complex-characters computer-games 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 extraterrestrial-life extremism family family-dynamics family-relationships fantasy 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 genius genius-protagonist geniuses genocide gifted-children government government-conspiracy government-control government-manipulation great-adventure halo-universe heroism human-empathy human-extinction human-survival humanity identity intelligence intense intergalactic-war intergalactic-warfare 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 mind-manipulation moral-ambiguity moral-dilemma moral-dilemmas morality outcast outer-space peer-pressure philosophy political-intrigue politics power power-dynamics power-struggle pre-teen-genius prejudice prodigious-intelligence prodigy protagonist psychological psychological-manipulation psychological-thriller psychological-warfare psychology redemption rivalry sacrifice school sci-fi science-fiction secrets self-discovery sibling-dynamics sibling-relationship sibling-relationships sibling-rivalry siblings simulation-games simulations soldier space space-academy space-battle space-colonization space-exploration space-fleet space-opera space-travel space-war space-warfare strategic-genius strategic-thinking strategizing strategy super-advanced-technology survival suspense suspenseful tactical tactical-genius talented-children teamwork technology telepathy thrill training trauma triumph trust underdog 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