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Of all the people that Korra expected to hear from on her birthday, the last one would be the one who basically ruined her life. He had framed her for cheating, gotten her kicked out of college, and stole her girlfriend; Iroh was the embodiment of everything that Korra hated. Why she opened the email from him, she'll never know, but that was the moment when everything changed, that was the moment she met R.A.a.V.A..
R.A.a.V.A. or "Reactive Augmentation and Variable Assistance" was an unique piece of government software that stored nearly infinite quantities of data and used an AI assistant to retrieve data and aid in processing. On it's own it was a formidable piece of software with nearly limitless capacities, but in the hands of a human operator, she turned them into a living weapon that only the truly worthy could wield. And Korra just happened to be lucky enough to get (for reasons she wished she knew) the entirety of this brilliant and terrifying computer entity downloaded into her brain.