"Mother... is that you?"
Name:
Jack the Ripper
Gender:
Female
Age:
Unknown, presumably an early teen.
Advantages:
Jack the Ripper is a serial killer with superior assassination tactics, proving to be great with blades, murder and dexterity.
She has capabilities in low-tier, self-taught first aid. Give her a needle and some thread and she's ready to fix a wound.
Disadvantages:
Serial killers are known for being mentally polluted, and Jack is no exception.
She might confuse an individual as her mother. This can be disadvantageous in both ways due to two possible scenarios - 'mother' will take advantage of her, or Jack will eventually want to cut a hole in the womb of 'mother' if she proves to be a great ally. tl;dr mommy issues gone crazy. This bond can be taken advantage of, too.
Her victims are mostly women. Exceptions will only apply when she retaliates in self-defense, and even then, she will at best do what she can to escape.
Other Information:
As this Jack the Ripper has been taken from her own time period and is not a Servant summoned by the Holy Grail or the FATE System, she lacks the capabilities of a Servant and is bound by the laws of reality and existence. No Noble Phantasm, no stats and such.
But that does not in any way make her any less dangerous. Jack the Ripper by any other name is Jack the Ripper.