"Resident Evil 4 Remake: The Mystery of Ada Wong and Wesker's Absence in Mercenaries Mode"

Ada Wong and Wesker are not included in the Mercenaries Mode for Resident Evil 4 remake at launch, but their content has been datamined by fans, indicating that Capcom may release it as premium DLC in the future to extend the game's profile throughout the year. It's also possible that they will be included in the Separate Ways side story or Assignment: Ada minigame, which have not been officially confirmed by Capcom.