Reze appears to be a young woman or girl, and is of slender build. She has shoulder-length purple hair and emerald-green eyes. She is shown to be prone to blushing heavily. While posing as a civilian, she is seen wearing a choker in order to conceal the grenade pin in her neck, which she uses to transform. When introduced, 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.