Hannah's an introverted and withdrawn person; she often has her head tilted down as a way of avoiding eye contact with others. Hannah appears to be terrified of her master, Alois, and is calm and reserved - except for the moments in which he's speaking to her. In these moments, she's brisk, nervous, and will even tremble with fear. However, during her duel with Sebastian, Hannah displays great confidence in herself and openly mocks him for taking the time to fix his clothes. Hannah is extremely loyal to Alois; she's willing to be being beaten by him and goes as far as removing almost all of her clothing when he wanted to use her clothes for a costume. Her biggest ambition is to provide Alois with happiness, and thus, she endures his abuse. She knows how to speak Welsh, as shown when she sings to Alois the Welsh lullaby, Suo Gân.Before she met Luka Macken and formed a contract with him, Hannah was an apathetic, bored demon who had the demon triplets subjugated under her. She'd grown tired of eating human souls and was uninterested in them until Luka appeared, asking for a contract to destroy the village that caused his brother's tribulation. His sheer innocence and determination for Alois' happiness made her realize that he's different from other humans. Hannah decided to fulfill his wish to kill the townspeople and he thanked her before dying, something no other human had ever done. This caused her to be attached to Luka and she was mournful when devouring his soul. Hannah retains Luka's soul inside her and she soon watches over Alois by becoming his maid. Apparently, she has adopted Luka's desire for his brother's happiness and works to accomplish that, as well.