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Growing up in a middle-class household, Kari never wanted for anything. Well, except world peace. And a life without boredom. And the destruction of the dog-eat-dog system of the world. And-, well, you get the point. She learned the reality of the world when she was but 5, when her rare trading card was stolen. The teachers banned the game because of this, and the other children blamed her, going so far as to claim it wasn't stolen and that she just wanted to get the game banned! This made her depressed and anti-social for a while, but she returned to normal about a year later. Then the second tragedy struck. Her favorite video game was taken from her hands as she played it, and the older children who took it held it too high for her to reach. So she reached for their throat instead. She didn't choke them for too long, just long enough to make them lower their hands so she could grab her game back, but it didn't matter to the adults. She was the one who got in trouble, her parents making her throw away her precious game, the bullies who did it getting away untouched. Her disillusionment grew.
By her teenage years, she was known as a troublemaker and a rather dangerous enemy to make. With no care for weak or illogical rules, she would go above and beyond to make those who harmed her, or the younger children, pay for their actions. Even the older students at her school became afraid of her, leading to a large drop in bullying throughout the grades as a whole. That is, until she went too far and knocked a bullying transfer student unconscious on the day Kari turned 14. She was expelled that day. On an "entirely unrelated" note, the rate of bullying in the school skyrocketed the following week.
At age 15, Kari, who had grown strong physically from throwing herself into working out to relieve her anger at society, became obsessed with anime. Not especially surprising for a 15 year old, but the lessons she learned from Sailor Moon and the like were different than what the English dubs wanted kids to learn. She'd need to get stronger still if she wanted to defeat the villains of the world. She didn't have a team to rely on, or magical powers. She'd have to find another way.
Exactly one month after she turned 16, her favorite video game of all time was released. She loved it more than anything, and it became her newest obsession. So much so that she would have reoccurring dreams about it. Moreso, when she learned to lucid dream on command (when she realized she was in a dream, that is) at age 17, she would constantly make her dreams be about it.
Age 18, Kari had played her game well over 100 times, logging uncounted hours of playtime. She became a NEET for a few months before getting kicked out of her parent's home and ending up in a tiny apartment of her own that she can, to this day, barely pay rent for. Recently having turned 19, she's begun looking into colleges that she might be accepted into, but she has no idea of what she would study for.