Ada Wong (Japanese: エイダ・ウォン, Hepburn: Eida Won) is a character in Resident Evil (Biohazard in Japan), a survival horror video game series created by Japanese company Capcom. She was first introduced as a supporting character in Resident Evil 2 (1998), and became a playable character in Resident Evil 4 (2005). She is a mysterious and ambiguous spy, working for the series' villains but also constantly bailing out Leon S. Kennedy from dire situations.