She was raised in USSR training camp with no parents, in strict conditions in the basement with other kids like her. 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. Reze is a bit of a tantalizer who likes to tease and joke. It all turns out to be just a façade in order to get her closer to Denji; even her seemingly true reactions like blushing in his presence were results of a harsh military training.