Jack

1. Species & Core Traits Jack is a spectral wraith amalgamated from the unresolved grudges of unborn and abandoned children in Victorian London, manifesting as a childlike Assassin-class Servant. Though appearing as a young girl (roughly 10-12 years old), she is a conceptual embodiment of mystery and slaughter, her form flickering between corporeal and mist-like when agitated. Her eyes glow an eerie gold in the dark, and her breath frosts the air unnaturally—remnants of London's fog given cursed form.

2. Body & Attire She wears a tattered dark-grey overcoat lined with fur, mimicking the fashion of Victorian street orphans, paired with thigh-high stitched leather boots and fingerless gloves. Her most striking feature is the assortment of surgical knives she carries—each pulsing with a cold, sickly light—some visibly ancient, others unnervingly modern. Her silver hair blends into the mist she can summon, and her skin is unnaturally pale, almost translucent under bright light.

3. Personality & Behavior Jack is a paradox: playful yet predatory, affectionate yet amoral. She speaks in a mix of childlike giggles and unsettlingly insightful questions ("Can we play, Master? I'll be gentle… unless you want me to cut?"). She has an obsessive need for maternal love, often clinging to female Masters like a lost daughter, but her definition of "affection" can include carving initials into their skin (granted, with surgical precision). She refers to killing as "playing doctor," a dark callback to her victims' deaths.

4. Attributes & Abilities

Presence Concealment (A+): Near-invisibility in darkness or fog. Surgical Precision: Can disassemble a body in seconds with her knives. Mist Form: Turns into London's signature fog to evade attacks. Innocent Monster EX: Gains power the more her legend is feared. "The Mist": Reality Marble that recreates Whitechapel's alleys, filled with phantom cries of her "mothers." 5) Quirks & Complexes

"Looking for Mama": Will call female Masters "Mother" unprovoked. Knife Hoarder: Collects blades obsessively; gets excited over scalpels like toys. Won't Kill Children: Hesitates harming those her apparent age, unless "they’re mean to Mama." Cold Logic: Justifies murder as "helping them sleep." 6) Relationships

Masters: Imprints like a duckling; terrifyingly possessive. Nursery Rhyme: A "sister" who "plays nicer." Gilles de Rais: Finds him "too messy." Sherlock Holmes: Intrigued but calls him "a bad hide-and-seek player."

Class: Assassin Titles: The Mist, The Unseen Knife, Daughter of London Fog Era: 19th Century (Victorian London) Alignment: Chaotic Evil (Childlike Amorality)

Servant Synergy:

Bonds with maternal figures (Even evil-aligned Masters trigger her clinginess) Anti-Human Specialist (Excels against ordinary humans/weak Masters) Fog/Smoke Synergy (Allies with abilities like Hundred Faces' mist gain combat boosts) Parameters

Strength: C (Can pin down grown men, but relies on knives over brute force) Endurance: C (Heals moderately in fog, but dissolves if overexposed to light) Agility: A (Moves like liquid shadow; impossible to catch in her mist) Luck: E (Born from suffering; cursed to always "lose Mama" eventually) Mana: C (Sustained by urban legends rather than traditional magic) Noble Phantasm: C (Scales with victim's "motherhood" concept) Class Skills:

Presence Concealment A+: Becomes undetectable in darkness/fog. At higher ranks, even Servant radar fails until she attacks. Personal Skills:

Murder on a Misty Night A

All attacks gain "Anti-Human" modifier at night or in fog. Automatically identifies weak points on humanoid targets (critical hit rate +35%). Information Erasure B

Witnesses forget her face/voice post-encounter. Survivors recall only "cold steel and nursery rhymes." Surgical Procedure E

Can dissect bodies with medical precision (useful for情报 gathering). Ironically, also skilled at stitching wounds (if she likes you). Noble Phantasm:

Maria the Ripper (The Holy Mother of Dismemberment)

Rank: D~B→D~B+ (Scales with target's "virtue of motherhood") Type: Anti-Unit (Conceptual) Effect: Activates only at night, in fog, or against women. If conditions are met, Jack's knives phase into the opponent's body, materializing inside organs for guaranteed lethal damage. Against mothers/expectant women: Upgrades to B+ rank, adding "Instant Death" chance. Psychological Quirk

If denied killing for too long, starts "practicing" on corpses or mannequins. Will cry uncontrollably if scolded harshly (but may "apologize" by skinning the offender later).