In the article a framework of lexical-thematic group Evil is represented in J. K. Rowling’s Harry Potter, broadly along the lexical semantics, and text linguistics approach in English. Within the proposed model of scientific description, all aspects of characterization of the lexical-thematic group Evil has been explained in terms of textual properties and statistical particulars, viz. properties of consciousness, intention, and perception which are cognitive operations imposed on the textual structures on the occasion of use. Lexical meanings described in the research are dynamic and sensitive to contextual demands, rather than fixed and stable. The study of the lexical-thematic structure of the fantasy text is related to the word and its functioning in the text of the sequel. A lexical-thematic group is understood as a group of words united on the basis of the presence of a common thematic component in the semantic structure of these words. Evil is not easy to portray in a fantasy text. This notion covers a variety of feelings, actions and thoughts, which are reflected on three narrative levels: anthropomorphic, zoomorphic and floromorphic in J. K. Rowling’s Harry Potter. Using modern statistical approaches, lexical-thematic units rendering a palette of negative emotions have been found to be reinterpreted figuratively through the prism of images. The effectiveness of the statistical particulars was proved.