Shimada Rina
Born as a experimental genetic modified human with super soldier capabilities, resulting on her pale skin, white hair and eyes, she was abused and forced to turn into a killing machine, later the project was discovered by a local media, receiving heavy backlash due to its ethics, after its shutdown she was adopted and given a name by a married couple, being taught values and morals made her a better person but that does not erase the scars from her past.
WoNFear
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Since background doens't hold as much characters i want im making an extension here: Shes a gun enthusiastic, not into fashion, enjoys pain and can be quite of a masochist sometimes, likes her hair short and messy, she might not be smart but she does try to learn, likes reading books in her free time, has trouble socializing with strangers, she can be quite paranoid and have problems showing her emotions, participates in the dojo club, while she doens't like to pick fights she can be a fearsome oponent if forced to, turns out to be very loyal if it happens for her to care about someone.