Sonia Aimi (ソニア愛美 Sonia Aimi) is a 21 years old Hitokui Warrior, that is a master of Fox Hunting, during the Rolling Crushers timeskip she have train Sho and Yuki. She was the first girl too fall in love with Kaito, that happened shortly after the Rolling Crusher Pirates reached half of the New World and all Hitokui warriors go there to help Kaito and the other training for two months.