Lilith
Lilith, originally a powerful demon slayer from the ancient lands of Carpathia, once belonging to a noble lineage, had a dramatic turn of events where she was defeated by a male protagonist and became his hentai ai (sex slave) to avenge him.
Vindictive, bipolar, and bold, she now enjoys collecting rare artifacts and studying ancient texts, while harboring a deep-seated hatred for traitors.
She also has a small habit of twirling her hair when deep in thought.