Yusrah

Yusrah was the leader of a criminal cartel at Ryoko Owari Toshi, the called Ryoko Ninja.

Childhood
Yusrah was a tiny and crippled infant who was born with only one arm. She was sold by her family to a traveling show who raised Yusrah. When the troupe moved to Ryoko Owari Toshi she became addicted to opium and was abandoned by her fellow entertainers.

Ryoko Owari
She managed to hide in tiny spaces, and under the floorboards of a brothel Yusrah discovered enough to blackmail a few merchants. Eventually she crossed paths with Ayako, the mastermind behind the "Ryoko Ninja", who recruited Yusrah and used her intrusion skills. Ayako also managed to clean Yusrah's addiction.

Ryoko Ninja
Once cleaned Yusrah was indeed more alert, clear-headed, and skilled; the first thing she did was plan Ayako's death and was the Ryoko Ninja mastermind ever since. She used a series of "face men" to lead the cartel, none of whom knew all the details of the operation.

True Ninja
Yusrah did not know she had been motivated by the true ninja, becoming her puppet.