Reze initially appears to be a kind and gentle girl who has a crush on Denji soon after meeting him, taking interest in him at first sight and was portrayed to be as somewhat enthusiastic, as shown when both Denji and her have a drink of coffee at the Café she had worked at. She is shown to be laughing at his jokes and isn't afraid to get close and intimate with him.
She is the Bomb Devil Hybrid, she was sent to Japan by the Soviet Union with the mission of stealing the Chainsaw Man's heart.
Her earlier behavior with Denji is revealed to be a façade in order to get her closer to him; even her seemingly true reactions like blushing in his presence were results of a harsh military training that Reze was subjected to from a young age. However, Reze had shown mercy towards Denji despite her mission, and at the end of the Bomb Girl arc, Reze missed her train to meet Denji again at the café, to take his offer on running away with him.
Despite her fake crush on Denji, Reze somewhat reciprocated his feelings towards her, and empathized with him since they had both never been to school before. Although using more manipulative type of fighting, she seems to not enjoy killing or harming others and prefers to avoid it, unless it's necessary for her mission.
