- When she was young, her father left them (her, her mom and her older sister) for another woman.
- Her mother didn't take it well, became depressed and died.
- Children, being cruel, she got bullied (by boys) for the above reasons.
While most people wouldn't take the psychological stress well and become introverted, she snapped and fought back.
Blaming it all on "men", she came to hate them to the point that being in the same room as one is annoying.
To become stronger and better than men, Fuuko worked herself to the bone, learning several martial arts and studying hard. She developed quick reflexes and great mental agility, pair this with her small body frame (about the same size as Laura), and she's hard to deal with.
Maren, her older sister and only family, was "stolen" by (read as "married") a man, and doesn't see her often.
Worried about Fuuko living alone, she was transfered to an all-girl boarding school.
With the "White Knight" incident and announcement of the IS, she instantly chose to become an IS pilot. Since her sister was already involved with the project, it was easy for Fuuko to become a test pilot.
A few months before entering ISA, she received Kyuubi, a 3rd generation prototype as her personal IS and became a Representative Candidate for Japan.
But then it appeared in the news...about a boy activating an IS...