Yukika and Riho Yoshi

Yukika and Riho Yoshi are the quanetary antagonists of the first series. They are twin sisters and assassins for the cartel who were the loyal apprentices of Ryu Miyazoto. Despite an austere, mechanical physicality and virtually emotionless interaction, they were a fearsome presence who killed without hesitation or emotion.

Personalities
Yukika and Riho are extremely dangerous, cunning, cold, emotionless and psychopathic women. The twins both show dedication to the cartel, which was instilled in them by their master, Ryu, and demonstrated even more loyalty to Ryu. Ryu personally taught them from childhood to adulthood to become vicious and professional killers, who have murdered innocents needlessly, without any hint of remorse and they are even capable of wiping out entire groups of capable fighters. They have no qualms about killing children or the elderly. They also show loyalty and dedication towards each other.

Background
Yukika and Riho Yoshida were born on the Armageddi Islands and grew up in a small village on the North Island. However when the cartel came to take over the islands, Ryu Miyazoto and his psychotic goons came to their village and he led a destructive massacre which led to the village being burned down and the natives being brutally killed. Some women were kidnapped and raped by Ryu's men including the twins' mother, though the twins were instead spared and brought back to Ryu's home as Ryu found the potential and value in keeping them alive.

Yukika and Riho were trained by Ryu in the art of brutal assassination, martial arts, hunting techniques and use of weaponry and were raised from childhood to become loyal and fearsome assassins of the cartel. Ryu's ruthless training and the naturally brutal nature of the cartel had hardened the twins to the point of desentizing them to the extreme violence and murder on the islands, making them emotionless yet loyal and efficient killers in the employment of Ryu and his boss, Hector Bolsa.