A brilliant young lady in whose veins runs the blood of an illuminated beast. Yanfei enjoys appraisal, reading and is very knowledgeable on many topics — most notably the law, due to her career as a legal advisor. With a strong sense of justice, Yanfei does not mind traveling to help her clients should they have trouble in different parts of Liyue. She claims to have extensive knowledge of the laws of the other nations in Teyvat — though, she notes Fontaine's law to be the most difficult.