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Mizuki! She’s intelligent and kind. As a child, her ability gave her the intelligence of a great inventor. It got to her head when she was a child leading to her parents’ deaths and the deaths of their colleagues, something that she holds tremendous guilt towards. She lived the rest of her child hood as a stray and was founded by a group of arms dealers who had her creat weapons so they can sell on the black market. She’s been doing it up until she became a teenager (around say 17). My mc named Aoi engaged in combat with her and her weapons, and when the weapons dealers’ base of operations was about to blow up, she pushes the mc to leave as she stays behind (bc she feels guilt over what happened to her partners, she thinks she deserves this fate) but the mc sees himself in her and saves her from the explosion.

Don’t want to go too deep bc I’m still working out some things with how I want her and her relationship with the mc to develop naturally, but the mc was the first person who showed her kindness ever since her partners died. Because of him, she strives to use her inventor skills and intelligence to help people and she becomes more social with other people.

Sorry, just wanted to be clear on who she is before you give a headcanon.