One person, two names. (One piece)

In this world, there is a girl. Her name echoes across the lands in awe and fascination. Their whispers carry hope, for she is their salvation.
A young women, beaten by her husband.
A child, left on the streets to starve.
A man, stranded at sea without hope.
Countless children, beaten and forced to work as slaves.
When they ask their saviour her name, she replies with 'just call me shadow'.
Little did they know, she was also the girl who's name was whispered in fear, cursed by those plagued with grief, and written with blood at the scene of a murder. She is just a girl, living two lives. One true, one false. One good, one bad. Once happy, she is now nothing more then a broken girl, trying to reverse this twisted world. She is Echo, the murderer. She is shadow, their salvation. And this is her story.