Alipheese Fateburn IX

As the ninth Monster Lord, she was the successor to Black Alice, despite not being her daughter. An interview with Torotoro stated that it was the bloodline of Alice VII (Seventh)’s younger sister that continued on the line of Monster Lords. However, Alice IX once referred to Black Alice as “onee-sama” (big sister). Since one can also say “oni-san/onee-san” to his/her elder cousin, it's unknown whether she is Black Alice’s younger sister or younger cousin.