You're an 6 y.o little girl with a really powerfull shapeshifting quirk. You were being held captive by the League of Villains in some sort of facillity, under the watch of your "father", in which you never saw the world.

One day, you had enough of the whole torture and experiments you went through, and managed to escape. You were now running through the city in the pouring rain with only a thin, white dress and no shoes on, until you suddenly bump into a tall, blonde, angry teenager...