Riara Astaroth is the main female protagonists in High School Akuma. She's the younger sister of Ajuka Beelzebub and Diodora Astaroth. She eventually becomes a candidate for the Astaroth Clan's next hair. She's the childhood friend of Rias Gremory and Sona Sitri and one of the most popular female devils in the Underworld (even after the Diodora incident).