You were born in the world of anthromorphs as a high wanted thief that stole prized items for the fun of it, you heard on the news that scientists created a mirror that let's you see your opposite and imagined the look on there faces if that turned out missing. You break in and sneakily grab it without anyone seeing and when you returned it started glowing and a duplicate of you launched put accidentally tackling you (Were reading persona to make your opposite)