Yaya Han is a cosplayer, designer, and author with more than 20 years of activity in the fandom world. Yaya has made over 400 costumes and has been featured in two U.S. network TV shows, countless magazines, books, newspapers, and online media. Yaya’s work has impacted cosplay profoundly and has helped shape it into a commercial industry. She is the first cosplayer to bring branded cosplay-focused sewing/crafting products to mass retail, and she chronicled the evolution of modern cosplay in the book Yaya Han’s World of Cosplay.