Sirius Romanée-Conti, Bishop of Wrath
Self-claimed wife of Betelgeuse. Covered in bandages ad dragging chains, she is overly excited maniac and when she senses her loved one inside Subaru, she first thinks her love had come back.
She has the ability to impose her emotions and her physical state with everyone around her, instantly forcing normal citizens to be empathetic to her and she uses this to brainwash and control them. They also take the same damage she receives, effectively turning them all into hostages.
This causes several deaths for Subaru, including times when he was driven mad from her influence.
Sirius is adept in combat, uses her chains and controls fire to fight.
She was eventually faced off by Priscilla and Liliana the bard. Liliana used her abilities to neutralize Sirius's empathy powers, and Priscilla defeated her with a flaming sword.