Yes, that's good.
Name: Spencer Hilden
Age: 17 (probably. No exact birth date was given.)
Appearance: Spencer is about 1.73 metres tall.
When in public, she dresses like this. She wears pants while in public, but wears a skirt in school.
History: Spencer's early history is unknown, but she recalls spending at least 6 years of her life in intensive physical and mental training as an assassin for the British firms. (British firms is a euphemistic phrase referring to organised crime groups in the United Kingdom.) Her first kill happened at the age of 8, when she shot a kindergarten teacher that was related to a local police captain. She would continue to make kills, roughly around 10 a year, and begun to make her own assassination plans when she was 10 years old.
When she was 13, she was moved to from London to Texas to assist the burgeoning British organised crime scene there. It was just a few days after that when she was ordered to assassinate the Undying Man. The Undying Man at the time was a local cash advance company owner by the name of Hubert Pratt who refused to pay protection money and was believed to be an informant for the local police. Spencer planned out the assassination of the Undying Man, but failed for obvious reasons.
Startled by her failure, and worried that her masters would punish her for it, Spencer called the FBI and turned state's evidence. 60 members of her former organised crime group were successfully arrested due to her testimony, and half of them executed for murder or conspiracy to murder.
Spencer would take a chance in the witness protection programme and was moved to California. She was rehabilitated in normal society by psychologists after a month, and has spent about 3 years in a normal life in school, living quite the normal life. Other than the fact that she hangs at the local police precinct a little too much and figures out a murder victim's cause of death usually before the actual autopsy happens.
Her cover story is that she's an overseas student from the United Kingdom, who was sent here on scholarship by her father.
Skills:
Trained Killer: Spencer can work out an assassination plan rather quickly, though it's 3 years since she actually killed someone, so don't rely on it.
CQC: Spencer is skilled in close-quarters combat, particularly with short knives and unarmed combat. She keeps fit as much as she can.
Gunplay: Spencer is highly skilled with a pistol.
Miscellaneous Crime Skills: From identifying counterfeit cash, figuring out the cause of death of bodies (roughly 80% success rate) from a quick glance... Being an assassin has taught a lot of things.
Not much. Her studies are decent.
Personality:There are 2 sides to Spencer, the mask she wears as a high school student, and the cold assassin heart that she's trying hard to kill off.
As a high school student, Spencer is a tomboyish high school student who revels in social interaction, but ultimately has no people she can call close friends. She makes it a point to be admired by the girls. Adulation is perhaps a substitute for actual companionship, and feeling like she fits into school.
The cold assassin heart inside her hasn't gone away, though it's warming up slowly. Though she still analyses a lot of things from an assassin's point of view, she's a lot more cheerful about it, even though she won't say it to anyone she knows in school.
Misc: Though the rules of Witness Protection ban her from owning a gun, she owns a wholly plastic modified Glock that can bypass metal detectors. This pistol has 17 rounds, and also can have a silencer attached to it.