Not as Jiu Jitsuey as I would have liked. But it’s been pointed out to me that I wouldn’t think a Street Fighter was Brazilian Jiu Jitsu enough unless they could hold you down for 99 seconds and make the timer run down, ha ha.
Confirmed on Capcom’s Japanese website to be Sean’s older sister (姉), and practicing the family style of Matsuda Jiu Jitsu.
Presumably it was taught to her by her Japanese grandfather, as it was canon he was teaching Sean Jiu Jitsu.
-From before meeting Ken did he have sure killing technique experience?
A. From the time as a child being taught jujutsu from his Japanese descent grandfather, from the time he was 10 years old he was firing up for soccer and basketball and other sports.
-SF3 Q&A from Gamest SF3 Fanbook