Ada Wong (Japanese: エイダ・ウォン Hepburn: Eida Won) is a fictional character in the Resident Evil (Biohazard in Japan) horror franchise by Capcom. She is a mysterious and ambiguous antihero figure, working for the series’ villains but also helping the protagonist Leon S. Kennedy.
Introduced as a supporting character in the video game Resident Evil 2 in 1998, Ada (/ˈeɪdə/) later appeared as a player character or in supporting roles in the video games Resident Evil 4, Resident Evil: The Umbrella Chronicles, Resident Evil: The Darkside Chronicles, Resident Evil: Operation Raccoon City and Resident Evil 6, as well as in the animated film Resident Evil: Damnation. The live-action film series‘ version of Ada appeared in Resident Evil: Retribution. Ada was well received and became one of the most popular characters in the series.