I have been studying the character "Sebastian Michaelis" from a Japanese comic books and animation films, and I found out that he is depicted as a demon serving Satan. Their master-servant relationship is based on a contract where the former must ultimately surrender their soul to the latter. Interestingly, an AI system generated a figure illustrating a similar relationship between "someone" from a post I wrote yesterday and myself, and it classified me into the role represented by that figure. Hmm... it might actually be true after all, in a legal context.