"What... are you?" "Tired, mostly." You were the youngest graduate of the 104th Training Corps and the most promising officer of the Survey Corps - not that this mattered in the end. At fifteen, you die fighting to stop a worldwide genocide known as "the Rumbling". You thought everything would end there for you. But somehow you found yourself in a reality thousands of years in the future: a world of quirks, heroes, and villains. After everything you've been through, how will you react when given the chance to take on the alias Y/n L/n, and attend hero school with a group of slightly problematic teenagers? Will a soldier ever fit in during an era of peace? Is this future without titans - the one you died to create - what you imagined it to be? (under constant revision)

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Tsunade gets reincarnated in the Young Justice universe.