Hsien-Ko (Lei-Lei, レイレイ, Rei-Rei in Japan) is one of the main heroes that was first introduced in Night Warriors: Darkstalkers' Revenge along with her sister, Mei-Ling (Lin-Lin, リンリン, Rin-Rin in Japan). Her character is based off the Chinese hopping vampire, also known as a Jiang Shi (also known as a Kyonshi in Japanese) of Asian myths. She has appeared in many cameos such as Ken's party from the Street Fighter series, and many Capcom and Namco games such as Pocket Fighter, Project X Zone, Namco X Capcom, and Marvel vs. Capcom 3.