Fei Ya, known as Ya Fei in the original Chinese version of 'Battle Through the Heavens,' is a prominent character who plays the role of a talented auctioneer and businesswoman. She is affiliated with the Mittel Auction House and is known for her intelligence, charm, and negotiation skills. Fei Ya assists the protagonist, Xiao Yan, by providing valuable resources and information, often becoming an important ally in his journey. Her composed demeanor and resourcefulness make her a key supporting character in the series.