The young BMX (whose name allegedly stands for Black Moon eXtreme) is a former student of the Jade Dragons. Her father had her drop out after he learned that people in that school get up to a few too many shenanigans and got her a private tutor instead. Her family runs the dreaded "Zero Hold", a prison island built especially to contain members of the wulin.
BMX used to be a bit air-headed, carefree, and promiscuous. When her father put a stop to her old lifestyle it was a bit of a reality check and she's matured considerably since then. She changed her "gothic lolita" look slightly by easing up on the extravagant lace and silk dresses.