[In canon Jack here is literally Jack the Ripper and a 'Heroic Spirit' summoned to fight in a war over the Holy Grail. Her official class is Assassin and she's all sorts of scary powerful. And eats hearts.
Reincarnated she's an orphaned child forced out on the streets by her prostitute mother, who, with her first echo, has gotten back her silver-white hair and is currently rummaging around in a trash can that's a little too big for her.
Her weight on it, however slight, causes it to fall with a crash and after taking a moment to recover she crouches down over its spilled contents with a deeply concentrated expression.
There may or may not be a knife held tightly in her fist.
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Reincarnated she's an orphaned child forced out on the streets by her prostitute mother, who, with her first echo, has gotten back her silver-white hair and is currently rummaging around in a trash can that's a little too big for her.
Her weight on it, however slight, causes it to fall with a crash and after taking a moment to recover she crouches down over its spilled contents with a deeply concentrated expression.
There may or may not be a knife held tightly in her fist.
(spoiler: there is)]